All Tools

Percentage Calculator

Calculate percentages, find X% of Y, percentage change

Ratio Calculator

Simplify a ratio and see the reduced form

Number to Words Converter

Convert numbers to written English words

Scientific Notation Converter

Convert between standard and scientific notation

Decimal to Fraction Converter

Convert decimals to fractions and vice versa

Quadratic Formula Calculator

Solve ax² + bx + c = 0 with step-by-step solution

Inequality Solver

Solve linear, compound, and absolute value inequalities with graphs

Polynomial Calculator

Add, subtract, multiply polynomials with step-by-step solutions

Average Calculator

Calculate mean, median, mode, and range from a list of numbers

Slope Calculator

Calculate slope (rise/run) between two points

Combination Calculator

Calculate nCr combinations and nPr permutations

Distance Formula Calculator

Calculate distance between two points using the distance formula

Logarithm Calculator

Calculate logarithms: log base 10, natural log, and custom base

Standard Deviation Calculator

Calculate standard deviation, variance, and other statistics from a dataset

Z-Score Calculator

Calculate z-score and understand normal distribution percentiles

Percentile Calculator

Calculate percentile rank and find values at specific percentiles

Probability Calculator

Calculate probability for AND, OR, NOT, and conditional events

Confidence Interval Calculator

Calculate confidence intervals for sample means and proportions

Exponent Calculator

Calculate powers with negative and fractional exponents

Percentage Change Calculator

Calculate percent increase or decrease between two values

Permutation Calculator

Calculate nPr permutations with step-by-step formula breakdown

Mean Median Mode Calculator

Calculate mean, median, mode, range, and more statistics from a dataset

Probability Distribution Visualizer

Visualize normal, binomial, Poisson, and other probability distributions

Equation Solver

Solve linear and quadratic equations step by step with detailed work shown

Binomial Distribution Calculator

Calculate binomial probabilities with distribution visualization

Chi-Square Test Calculator

Perform chi-square goodness of fit and independence tests

Scientific Calculator

Full-featured scientific calculator with trig, logarithms, exponents, and memory functions

Speed Distance Time Calculator

Calculate speed, distance, or time from any two known values with unit conversions

Moving Average Calculator

Calculate simple, weighted, and exponential moving averages from a data series

Average Speed Calculator

Calculate average speed, distance, or time for trips with multiple segments

BMI Calculator

Calculate Body Mass Index from height and weight

BMR Calculator

Estimate basal metabolic rate (BMR)

Body Fat Calculator

Estimate body fat percentage from BMI

Calorie Needs Calculator

Estimate daily calories by activity level

Ideal Weight Calculator

Estimate ideal weight from height

Pace Calculator

Calculate running pace and race finish times

Calories Burned Calculator

Estimate calories burned from any activity

Macro Calculator

Calculate protein, carbs, and fat targets

Sleep Cycle Calculator

Find optimal wake times based on 90-min cycles

One Rep Max Calculator

Estimate 1RM from weight and reps

Heart Rate Zone Calculator

Calculate training zones based on max HR

Hydration Calculator

Calculate daily water intake needs

Protein Calculator

Calculate daily protein requirements

Due Date Calculator

Calculate pregnancy due date from LMP or conception

Conception Date Calculator

Estimate when you conceived from due date or birth date

Ovulation Calculator

Predict ovulation date and fertile window

Pregnancy Weight Gain Calculator

Track recommended weight gain during pregnancy based on pre-pregnancy BMI and week

Fasting Calculator

Track intermittent fasting windows (16:8, 20:4, etc.)

Steps to Miles Converter

Convert steps walked to miles or kilometers

Water Intake Calculator

Calculate personalized daily water needs

Blood Type Calculator

Predict possible child blood types from parent blood types

Waist-to-Hip Ratio Calculator

Calculate WHR and assess health risk by body shape

TDEE Calculator

Calculate Total Daily Energy Expenditure and personalized calorie targets

Body Surface Area Calculator

Calculate BSA using Du Bois, Mosteller, and other medical formulas

Lean Body Mass Calculator

Calculate lean body mass and fat-free mass index (FFMI)

VO2 Max Calculator

Estimate VO2 max using multiple test methods with fitness classification

Blood Alcohol Calculator

Estimate blood alcohol content (BAC) based on drinks, weight, gender, and time

Alcohol Calorie Calculator

Calculate calories in alcoholic drinks by type, size, and ABV percentage

Screen Time Calculator

Calculate and visualize your daily screen time across devices and activities

Air Quality Index Calculator

Calculate AQI from pollutant concentrations with health guidance and breakpoint tables

Blood Pressure Calculator

Check your blood pressure category and get health insights based on AHA guidelines

Sleep Calculator

Calculate optimal bedtime or wake-up time based on 90-minute sleep cycles

Heart Rate Zone Calculator

Calculate your target heart rate training zones for optimal exercise intensity

Food Calorie Calculator

Look up calories and macros for common foods and track your daily meal intake

Pregnancy Due Date Calculator

Estimate your due date and track pregnancy milestones from LMP, conception, or IVF transfer date

Macronutrient Calculator

Calculate daily protein, carbs, and fat targets based on calories, goals, and activity level

Protein Intake Calculator

Calculate recommended daily protein intake based on body weight, activity level, and fitness goals

Cooking Measurement Converter

cooking measurement converter. Convert between teaspoons, tablespoons, cups, milliliters, liters, and fluid ounces

Liquid Measurement Converter

Convert between ml, liters, fluid ounces (US & UK), cups, pints, quarts, gallons, tablespoons, and teaspoons

Ounces to Grams Converter

Convert between ounces and grams with real-time conversion, presets, and reference table

Hectares to Acres

hectares to acres converter. Enter hectares to get acres instantly

Weight & Mass Converter

Convert between metric and imperial weight units

Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin

Length Converter

Convert between metric and imperial length units

Volume Converter

Convert between liters, gallons, and more

Speed Converter

Convert between km/h, mph, and m/s

Pressure Converter

Convert between bar, psi, and pascal

Energy Converter

Convert between joules and kilowatt-hours

Time Converter

Convert between seconds, minutes, hours, and days

World Clock

See current time in multiple cities worldwide with real-time updates

Area Converter

Convert between square meters and square feet

Power Converter

Convert between watts and horsepower

Cooking Conversion Calculator

Convert cooking units, ingredient weights, and oven temperatures for recipes

ASCII Table

ASCII codes with decimal, hex, and character lookup

Decimal to Hex Converter

Convert decimal numbers to hexadecimal

UUID Generator

Generate random UUIDs instantly

Binary to Decimal Converter

Convert binary numbers to decimal

Base Converter

Convert numbers between bases 2 and 36

Data Size Converter

Convert between bytes, KB, MB, GB, and TB

Binary File Size Calculator

Convert file sizes between decimal and binary units with bits/bytes support

Data Rate Converter

Convert between Kbps, Mbps, Gbps, and more

Storage RAID Calculator

Calculate usable RAID capacity for RAID 0, 1, 5, 6, and 10

Screen Resolution Converter

Scale resolutions while preserving aspect ratio

Password Generator

Generate secure random passwords

Password Strength Checker

Check password strength and estimate crack time

Data Transfer Time Calculator

Estimate upload and download time from file size and speed

Bitrate File Size Calculator

Calculate file size from bitrate and duration, or vice versa

Data Usage Cost Estimator

Estimate monthly data usage and costs by activity type

Internet Speed Converter

Convert between internet speed units (Mbps, Gbps, MB/s, KB/s) and calculate download times

DPI Calculator

Calculate DPI, PPI, print sizes, and resolution for screens and printing

Internet Bandwidth Calculator

Estimate download and upload times for any file size at various internet speeds

Screen Resolution Calculator

Calculate PPI, aspect ratio, and display quality metrics for any screen size and resolution

Image Resize Calculator

Calculate new image dimensions while preserving aspect ratio

Timecode Calculator

Add, subtract, and convert timecodes across frame rates for video editing

Frame Rate Conversion Calculator

Convert between video frame rates and calculate duration changes, speed, and dropped frames

Storage Recording Time Calculator

Calculate how long you can record video or audio on any storage device

Disk Space Analyzer

Find the biggest files and folders on your drive to free up disk space

Prime Number Checker

Check if a number is prime and see a quick reason

Fraction Visualizer

Visualize a fraction and see the simplified form

Multiplication Table

Generate a multiplication table up to any size

Unit Circle

Common unit circle angles with sine and cosine values

GPA Calculator

Calculate GPA from course grades and credit hours

Final Grade Calculator

Calculate required final exam score for target grade

Grade Calculator

Calculate your weighted course grade from components

Percentage to GPA Converter

Convert any percentage grade to GPA on a 4.0 scale

GPA to Percentage Converter

Convert GPA to percentage using 4.0, 5.0, or 10.0 scale

Roman Numeral Converter

Convert between Roman numerals and Arabic numbers

Prime Factorization Calculator

Find prime factors of any number with visualization

Long Division Calculator

Perform long division with step-by-step process

Study Time Planner

Allocate study hours across subjects by priority

Number Line Visualizer

Plot points and intervals on an interactive number line

Citation Generator

Generate MLA, APA, Chicago, and Harvard citations for books, websites, and journals

Flashcard Generator

Create, study, and self-test with custom flashcard decks stored in your browser

Periodic Table

Interactive periodic table with atomic data, electron configurations, and search

Molarity Calculator

Calculate molarity, moles, volume, and molar mass for chemistry solutions

Dilution Calculator

Calculate solution dilutions using C1V1 = C2V2 with serial dilution support

Reading Speed Calculator

Test your reading speed in WPM and estimate time to read books and articles

Sorting Algorithm Visualizer

Watch 10 sorting algorithms animate step by step with pseudocode, comparisons, and swaps

Pathfinding Algorithm Visualizer

Watch A*, Dijkstra, BFS, DFS, and Greedy BFS find paths on an interactive grid

Data Structure Visualizer

Visualize BST, AVL tree, and heap operations with animated inserts, deletes, and rotations

Recursion Visualizer

Watch the call stack build and unwind for Fibonacci, factorial, Tower of Hanoi, and more

Hash Table Visualizer

Insert keys and watch hashing, collisions, chaining, and open addressing animate step by step

Graph Traversal Visualizer

Build graphs and watch BFS, DFS, and topological sort traverse nodes in real time

Big-O Notation Visualizer

Interactive plot of O(1) to O(n!) complexity curves with operation count comparison

Fourier Transform Visualizer

Draw a waveform and watch it decompose into sine and cosine components in real time

Linear Algebra Visualizer

Apply 2D matrix transformations and watch vectors rotate, scale, and shear on a coordinate grid

Rubric Builder

Create custom grading rubrics with criteria, levels, and point values for any assignment

Weighted Grade Calculator

Calculate your weighted average grade across assignments and categories

Final Exam Grade Calculator

Find out what score you need on your final exam to get your desired grade

Random Student Group Generator

Create random groups from a class list for activities and projects

Grade Curve Calculator

Apply bell curve, square root, linear shift, or percentage scaling to test scores

GCD & LCM Calculator

Find the greatest common divisor and least common multiple

Random Number Generator

Generate random numbers within a range

Completing The Square Calculator

Convert quadratic expressions to vertex form with step-by-step work

Factoring Calculator

Factor polynomials and trinomials step by step showing GCF, difference of squares, and AC method

Bayes Theorem Calculator

Calculate conditional probabilities using Bayes' theorem with visual probability tree diagram

Midpoint Calculator

Find the midpoint between two points in 2D or 3D

Diamond Problem Solver

Find two numbers from their product and sum using the diamond method

Binary Calculator

Perform binary arithmetic and bitwise operations with multi-base display

Matrix Calculator

Add, multiply, transpose, and find determinants of matrices

Inequality Solver

Solve linear and quadratic inequalities with step-by-step solutions

Opus Metadata Viewer

Drag and drop an .opus file to view its embedded metadata and transcription

Tone Generator

Generate pure sine, square, and sawtooth tones at any frequency

Metronome

Simple metronome with adjustable BPM and time signatures

Frequency to Note Converter

Convert frequency (Hz) to musical note name and cents offset

Audio Timer

Timer with customizable audio alerts and chimes

White Noise Generator

Generate white, pink, and brown noise for focus or relaxation

Sound Level Meter

Real-time decibel meter using your microphone

Audio Frequency Spectrum Analyzer

Real-time frequency spectrum analyzer with FFT visualization from microphone

Speaker Frequency Sweep

Test speakers with a frequency sweep from 20Hz to 20kHz

Speaker Balance Test

Test left and right speaker balance with audio panning

Oscilloscope

Real-time audio waveform visualizer from microphone

Audio Latency Tester

Measure audio input/output latency in milliseconds

FFT Spectrum Viewer

Real-time frequency spectrum analyzer with bar graph display

Audio Dynamic Range Viewer

Visualize the difference between quiet and loud sounds in real-time

Sleep Sound Machine

Ambient soundscapes with drones, singing bowls, rain, ocean, and wind for sleep and meditation

Music Visualizer

Turn music into animated geometric shapes, circular waveforms, and radial patterns in real-time

Beat Consistency Visualizer

Measure rhythm timing accuracy by tapping along to music with visual feedback

BPM Tapper

Tap to estimate beats per minute

Dice Roller

Roll virtual dice for D&D and tabletop games with multiple dice types

Instrument Tuner

Tune guitar, ukulele, bass, and more using your microphone

Text to ASCII Art

Convert text into large ASCII art letters with multiple styles

Before & After Slider

Compare two images with an interactive before/after slider

Clothing Size Converter

Convert between US, UK, EU, and international clothing sizes

Ring Size Converter

Convert ring sizes between US, UK, EU, and millimeters

Recipe Scaler

Scale recipe ingredients up or down for any number of servings

Creative Writing Prompt Generator

Generate random story ideas, character concepts, and writing inspiration

Chart Generator

Create pie, bar, line, and donut charts from your data

Age On Other Planets Calculator

Calculate your age on Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto

Reaction Time Test

Test your reflexes by clicking when the screen turns green

Click Speed Test

Test your click speed and measure clicks per second (CPS) over timed intervals

Username Generator

Generate random usernames for social media, gaming, and any platform

Bingo Card Generator

Generate printable bingo cards with numbers or custom words

Zodiac Sign Calculator

Find your Western zodiac sign, element, and personality traits from your birthday

Numerology Life Path Calculator

Calculate your numerology life path number and discover its meaning

Moon Phase Calculator

See today's moon phase or calculate the moon phase for any date

Dog Age Calculator

Convert dog years to human years based on breed size

Cat Age Calculator

Convert cat years to human years with life stage classification

Lottery Number Generator

Generate random lottery numbers for Powerball, Mega Millions, and more

Fish Tank Stocking Calculator

Calculate how many fish your aquarium can safely hold

eDPI Calculator

Calculate effective DPI and cm/360 for competitive gaming mouse sensitivity

Crosshair Generator

Design custom gaming crosshairs with adjustable size, color, and style

Biorhythm Calculator

Chart your physical, emotional, and intellectual biorhythm cycles

Simple Interest Calculator

Calculate simple interest and total amount

Loan Calculator

Calculate monthly payments and total interest

Loan Amortization Schedule

Generate a full payment-by-payment breakdown with principal, interest, and balance

Mortgage Calculator

Estimate mortgage payments and totals

Refinance Calculator

Calculate break-even point on mortgage refinancing and compare monthly savings

Compound Interest Calculator

Calculate compound growth over time

Savings Goal Calculator

Estimate time to reach a savings goal

Inflation Calculator

Estimate future value with inflation

Credit Card Payoff Calculator

Calculate time to pay off debt and interest saved

Salary to Hourly Calculator

Convert annual salary to hourly rate

Hourly to Salary Calculator

Convert hourly wage to annual salary

Discount Calculator

Calculate final price after discount and savings

Discount Visualizer

Visualize discounts with interactive charts and comparison views

Discount Stack Checker

Test stacked discounts to see step-by-step price breakdown

Margin Calculator

Calculate profit margin from cost and selling price

VAT Calculator

Add or remove VAT from a price

PayPal Fee Calculator

Calculate PayPal transaction fees and net amount received for domestic and international payments, goods and services, and friends/family

Currency Converter

Enter an amount and exchange rate to convert between any two currencies. Shows inverse rate and conversion breakdown.

Net Salary Calculator

Estimate net salary using a flat tax rate

Gross Salary Calculator

Estimate gross salary from net and tax

Income Tax Calculator

Estimate US federal income tax and take-home pay based on 2024 tax brackets

ROI Calculator

Calculate return on investment

Break-Even Calculator

Calculate break-even point

Subscription vs One-Time Calculator

Compare subscription costs vs one-time purchase price over time with break-even analysis

Depreciation Calculator

Calculate asset depreciation using straight-line, declining balance, and sum-of-years-digits methods

Sales Tax Calculator

Calculate sales tax amount and total price

Markup Calculator

Calculate selling price from cost and markup percentage

Raise Calculator

Calculate new salary after a percentage raise

Stock Profit Calculator

Calculate profit/loss from stock trades with commissions

Stock Return Calculator

Calculate total stock investment returns including dividends, capital gains, and annualized performance

Overtime Calculator

Calculate overtime pay at 1.5x or 2x rate

Dividend Calculator

Calculate dividend income and yield from stocks

Car Payment Calculator

Calculate monthly auto loan payments and total cost

Investment Return Calculator

Calculate compound growth with regular contributions

Down Payment Calculator

Calculate home down payment and PMI threshold

Net Worth Calculator

Calculate total net worth from assets and liabilities

Rental Yield Calculator

Calculate rental property ROI and yield percentage

Debt Payoff Calculator

Compare snowball vs avalanche methods with payoff timeline

Debt Consolidation Calculator

Compare multiple individual debts vs a single consolidated loan with savings analysis

Debt-to-Income Ratio Calculator

Calculate your debt-to-income ratio to assess your borrowing capacity and financial health

Student Loan Calculator

Calculate monthly payments, total interest, and explore forgiveness options

Etsy Fee Calculator

Calculate Etsy seller fees including listing, transaction, and payment processing

AdSense Revenue Estimator

Estimate Google AdSense ad revenue from pageviews, CTR, and CPC

Paycheck Calculator

Calculate net pay from gross salary with tax deductions

Price Per Kg Visualizer

Compare product prices by weight to find the best value per kilogram

Burn Rate & Runway Calculator

Calculate startup runway from burn rate and available cash

Cap Rate Calculator

Calculate real estate capitalization rate and property value

Unit Economics Calculator

Calculate CAC, LTV, margins and unit economics metrics

Unit Economics Breakdown Tool

Analyze revenue, variable costs, and contribution margin per unit

Reorder Point Calculator

Calculate inventory reorder point with safety stock

Recipe Cost Calculator

Calculate food costs with yield loss and determine menu pricing

Safety Stock Planner

Calculate optimal safety stock levels from demand variability and service level

Small Business Shift Profit Analyzer

Analyze profit margins across different shifts to optimize staffing and operations

Menu Item Margin Heatmap

Visualize profit margins across menu items with color-coded heatmap analysis

Restaurant Break-Even Covers Planner

Calculate how many customers you need to serve to break even

Burn Rate Runway Calculator

Visualize startup runway from cash balance and monthly burn rate

Amazon FBA Fee Calculator

Calculate Amazon FBA fees, referral fees, and net profit per unit

Shopify Profit Calculator

Calculate Shopify fees, payment processing costs, and net profit per sale

Self-Employment Tax Calculator

Estimate 1099 self-employment taxes with quarterly payments, deduction simulator, and state tax support

Debt-to-Income Ratio Calculator

Calculate your DTI ratio with visual gauge, lender threshold comparison, and what-if debt payoff simulator

CAGR Calculator

Calculate compound annual growth rate with visual chart, year-by-year table, and reverse projection mode

Capital Gains Tax Calculator

Estimate federal and state capital gains taxes with short-term and long-term rates, NIIT surcharge, and filing status comparison

Home Affordability Calculator

Find how much house you can afford based on income, debts, and down payment with three-tier affordability display

Retirement Savings Calculator

Project retirement savings growth with visual chart, savings gap analysis, and 4% rule withdrawal estimate

401(k) Calculator

Estimate 401(k) growth with employer match, contribution limits, and Traditional vs Roth comparison

Crypto Profit Calculator

Calculate profit, loss, and ROI on cryptocurrency trades with fee calculation and tax holding period indicator

Rent vs Buy Calculator

Compare the total cost of renting versus buying a home over time with breakeven analysis and wealth comparison

FIRE Calculator

Calculate your path to financial independence with FIRE number, savings rate analysis, and Lean/Regular/Fat/Coast FIRE types

NPV Calculator

Calculate net present value from a discount rate and series of cash flows

IRR Calculator

Calculate internal rate of return for a series of cash flows

APR Calculator

Calculate true Annual Percentage Rate including fees and loan costs

APY Calculator

Calculate annual percentage yield from nominal rate and compounding frequency

Budget Calculator

Plan your monthly budget with the 50/30/20 rule or custom allocations

Credit Card Interest Calculator

Calculate how much interest accrues on a credit card balance over time

Annuity Calculator

Calculate present and future value of ordinary and due annuity payments

Bond Calculator

Calculate bond price, yield to maturity, current yield, and duration

CD Calculator

Calculate certificate of deposit earnings, maturity value, and CD ladder strategies

Future Value Calculator

Project how investments grow over time with compound interest and contributions

Present Value Calculator

Calculate what a future sum of money is worth in today dollars

Annuity Calculator

Calculate annuity present value, future value, and periodic payments

APY Calculator

Calculate Annual Percentage Yield and compare compounding frequencies

Auto Loan Calculator

Calculate monthly car payments with down payment, trade-in, and interest

Black-Scholes Calculator

Calculate option prices using the Black-Scholes model for calls and puts

Option Greeks Calculator

Calculate Delta, Gamma, Theta, Vega, and Rho for options pricing

WACC Calculator

Calculate weighted average cost of capital from equity and debt components

CAPM Calculator

Calculate expected return using the Capital Asset Pricing Model

Sharpe Ratio Calculator

Calculate risk-adjusted return with the Sharpe ratio formula

Fibonacci Retracement Calculator

Calculate key Fibonacci retracement and extension levels for technical analysis

529 Plan Calculator

Project college savings growth with 529 plan contributions and tax advantages

RMD Calculator

Calculate required minimum distributions from retirement accounts by age

Energy Label Visualizer

Generate EU-style energy efficiency labels (A-G) and calculate annual costs

Car Depreciation Calculator

Estimate vehicle value based on age, mileage, and type

Business Loan Calculator

Calculate business loan payments, total cost, and amortization

Amazon Profit Calculator

Calculate Amazon seller profit with FBA fees and margins

Solar Panel Payback Calculator

Calculate solar panel payback period, ROI, and lifetime savings

Time Card Calculator

Calculate weekly work hours, overtime, and gross pay from time entries

Pet Cost of Ownership Calculator

Estimate first-year and lifetime costs of owning a dog or cat

Emergency Fund Calculator

Calculate how much you need in your emergency fund based on monthly expenses, dependents, and risk factors

Tax Bracket Calculator

See which US federal tax brackets apply to your income and calculate effective tax rate

Wedding Budget Calculator

Plan your wedding budget with category breakdowns and cost tracking

Moving Cost Calculator

Estimate the total cost of moving based on distance, home size, and services needed

CD Interest Calculator

Calculate certificate of deposit interest, maturity value, and compare compounding frequencies with CD ladder strategies

Debt Snowball Calculator

Compare snowball vs avalanche debt payoff strategies with payment schedules and interest savings

Real Estate ROI Calculator

Analyze rental property returns with cash flow projections, cap rate, and 10-year equity growth

Bond Yield Calculator

Calculate current yield, yield to maturity, Macaulay duration, and bond pricing with comparison analysis

Sales Commission Calculator

Calculate sales commissions with flat rate, tiered, base+commission, and draw structures

EMI Calculator

Calculate equated monthly installments for loans with interest breakdown

Car Lease Calculator

Calculate monthly car lease payments, total cost, and compare to buying

Mortgage Prepayment Calculator

Calculate how extra payments reduce your mortgage term and total interest

Rent Affordability Calculator

Calculate how much rent you can afford based on income with budget breakdown and affordability thresholds

Investment Growth Calculator

Project investment growth over time with compound interest, regular contributions, and scenario comparison

Capital Gains Calculator

Estimate capital gains tax on investments, real estate, or other assets

Price Per Square Foot Calculator

Calculate and compare price per square foot for real estate, flooring, and construction projects

Dividend Yield Calculator

Calculate dividend yield, annual income, and yield on cost for stock investments

Business Valuation Calculator

Estimate business value using multiple valuation methods including SDE, EBITDA, and revenue multiples

Stock Average Calculator

Calculate your average cost per share when buying stocks at different prices

CD Ladder Calculator

Plan a CD ladder strategy to maximize interest while maintaining liquidity

Effective Tax Rate Calculator

Calculate your effective tax rate vs marginal rate with bracket breakdown

Property Tax Calculator

Estimate annual property tax based on home value and local tax rate

401k Withdrawal Calculator

Calculate taxes and penalties on early or regular 401(k) withdrawals

Boat Loan Calculator

Calculate monthly payments, total interest, and total cost for a boat loan

Hourly Paycheck Calculator

Estimate your take-home pay from hourly wages after taxes and deductions

Rent Increase Calculator

Calculate the dollar and percentage impact of a rent increase over time

Savings Interest Calculator

Calculate how much interest your savings will earn over time with regular deposits

Cash Flow Calculator

Calculate your monthly and annual cash flow by tracking income sources and expenses

Life Insurance Calculator

Estimate how much life insurance coverage you need based on income, debts, and family needs

College Savings Calculator

Plan and calculate how much to save for college tuition with projected costs and investment growth

Home Equity Calculator

Calculate your home equity, loan-to-value ratio, and potential borrowing power

Cost of Living Calculator

Compare cost of living between locations and calculate the salary needed to maintain your lifestyle

Closing Cost Calculator

Estimate closing costs for buying or selling a home including fees, taxes, and prepaid items

Lease vs Buy Calculator

Compare the total cost of leasing vs buying a vehicle with break-even analysis and multi-year projections

Depreciation Schedule Calculator

Calculate asset depreciation using Straight-Line, Declining Balance, Sum of Years Digits, and Units of Production methods

Child Education Cost Calculator

Project education costs for college and plan savings with tuition inflation, investment growth, and savings gap analysis

Interest Rate Converter

Convert between APR, APY, monthly, daily, and continuous interest rates with growth projections

Roth IRA Calculator

Project Roth IRA growth, compare to Traditional IRA, and plan retirement contributions

House Flip Calculator

Analyze house flip deals with purchase, rehab, and selling costs to estimate profit

IRA Contribution Calculator

Calculate IRA contribution limits, tax deductions, and projected retirement growth for Traditional and Roth IRAs

Take Home Pay Calculator

Estimate your net pay after federal and state taxes, Social Security, and Medicare deductions

Mutual Fund Calculator

Project mutual fund investment growth with SIP contributions, expense ratios, and compound returns

Overhead Cost Calculator

Calculate overhead rate, allocate indirect costs, and analyze overhead as a percentage of revenue or labor

Home Insurance Calculator

Estimate homeowner's insurance premiums based on home value, location, coverage, and deductible

Payback Period Calculator

Calculate how long it takes to recover an investment through cash flows, with simple and discounted payback methods

Net Present Value Calculator

Calculate NPV of an investment by discounting future cash flows, with IRR estimation and profitability index

Stamp Duty Calculator

Estimate property stamp duty and transfer tax by location with UK and US rate schedules

Wire Transfer Fee Calculator

Calculate the total cost of sending money via wire transfer with bank fees, exchange rate markup, and cost comparison

Business Profit Margin Calculator

Calculate gross, operating, and net profit margins with visual breakdown and industry benchmarks

Mortgage Affordability Calculator

Calculate how much house you can afford based on income and debts

Payroll Tax Calculator

Estimate Social Security, Medicare, and FUTA payroll taxes

Trucking Cost Per Mile Calculator

Calculate per-mile trucking costs with fuel, maintenance, insurance, and break-even analysis

Fuel Cost Per Mile Calculator

Calculate fuel cost per mile for any vehicle based on gas price and MPG

Retirement Countdown

Count down the days, hours, and minutes until your retirement date

Big-O Notation Visualizer

Interactive plot of O(1) through O(n!) complexity curves with operation count comparison

JSON Formatter

Format and beautify JSON with proper indentation

JSON Validator

Validate JSON syntax and show errors

CSV to JSON Converter

Convert CSV data to JSON format with auto-detection

JSON to CSV Converter

Convert JSON arrays to CSV format with nested object handling

JWT Decoder

Decode JWT tokens and display header and payload

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 hashes

Chmod Calculator

Convert between chmod numeric and symbolic notation

Base64 Encode/Decode

Encode and decode Base64 strings

Hex to Text Decoder

Convert hexadecimal to text and vice versa

Binary Text Decoder

Convert binary to text and text to binary

HTML Entity Encoder/Decoder

Encode and decode HTML entities

ROT13 Decoder

Encode and decode ROT13 cipher text

Morse Code Decoder

Convert morse code to text and vice versa

ASCII Decimal Converter

Convert text to ASCII decimal codes and vice versa

Unicode Codepoint Decoder

Convert Unicode codepoints to characters and vice versa

Crontab Generator

Generate cron expressions visually with next run times

SQL Formatter

Format and beautify SQL with dialect support, keyword case, indent control, and minification. Supports MySQL, PostgreSQL, T-SQL, Oracle, and more

Redirect Generator

Generate 301/302 redirect rules for Apache, Nginx, and more

CIDR Calculator

Calculate CIDR notation and subnet information

Subnet Calculator

Calculate subnet details from IP and mask

Bcrypt Generator

Generate bcrypt password hashes with configurable rounds

YAML Validator

Validate YAML syntax and convert to JSON

Markdown Preview

Live preview of Markdown rendering

Regex Tester

Test regular expressions and see matches

HTML Formatter

Format and beautify HTML with indentation

CSS Formatter

Format CSS with proper indentation

HTML Minifier

Minify HTML by removing comments and whitespace to reduce file size

Cron Schedule Validator

Validate 5-field cron expressions quickly

Simple Regex Tester

Test a regex pattern against sample text

XML Formatter

Format, beautify, and validate XML

Hex to RGB Converter

Convert hex color codes to RGB and HSL

Color Converter

Convert colors between HEX, RGB, HSL, HSV, and CMYK formats

HTTP Status Codes

Reference list of HTTP status codes with descriptions

JSON Diff Viewer

Compare two JSON objects and highlight differences

JWT Encoder

Create and encode JWT tokens with custom claims

Easing Function Explorer

Visualize and compare CSS easing curves interactively

Favicon Generator

Create favicons from text, letters, or colors with multiple sizes for all devices

CSV JSON Converter

Convert CSV to JSON and JSON to CSV

CSV Delimiter Converter

Change CSV delimiters without breaking quoted fields

URL Query Decoder

Parse and decode URL query parameters

URL Query Parser

Parse, edit, and rebuild URL query parameters with live updates

HTTP Header Size Analyzer

Measure total header bytes, per-header size, and oversized header risks

YAML JSON Converter

Convert YAML to JSON and JSON to YAML

HSL to RGB Converter

Convert HSL colors to RGB and hex codes

Unix Permissions Calculator

Convert between symbolic (rwx) and octal unix permissions

IP Address Converter

Convert between IPv4 decimal and binary notation

Color Palette Generator

Generate harmonious color palettes with complementary, analogous, and triadic schemes

Gradient Generator

Create beautiful CSS gradients with live preview and copy-ready code

Glassmorphism Generator

Create frosted glass CSS effects with backdrop blur and live preview

Color Picker

Visual color picker with HEX, RGB, HSL conversion and color harmonies

Box Shadow Generator

Generate CSS box shadows with live preview and layered effects

Border Radius Generator

Create CSS border-radius with visual editor for all corners

Flexbox Playground

Interactive CSS flexbox layout builder with live preview

Base64URL Encoder/Decoder

Encode and decode Base64URL (URL-safe Base64 variant)

Cron Expression Humanizer

Convert cron expressions to human-readable descriptions

MIME Type Lookup

Search MIME types by extension or keyword

HTML to Markdown Converter

Convert HTML to clean Markdown format

JSON to XML Converter

Convert JSON data to XML format

XML to JSON Converter

Convert XML data to JSON format with configurable attribute handling

JSON Size Estimator

Estimate JSON payload size in bytes, KB, and compare raw vs minified

SHA-256 Generator

Generate SHA-256 hashes from text using Web Crypto API

SVG ViewBox Visualizer

Visualize and edit SVG viewBox interactively with live preview

CSS Specificity Calculator

Calculate and compare CSS selector specificity scores

CSS Grid Gap Calculator

Calculate exact grid track sizes from container dimensions, gaps, and padding

Regex Cheatsheet

Interactive regex reference with patterns, examples, and live testing

Base64 Image Decoder

Decode base64 strings to image preview with download

Image to Base64 Converter

Convert image files to base64 encoded strings for embedding

JWT Expiry Checker

Check if a JWT token is expired and see expiration time

QR Code Scanner

Scan and decode QR codes from uploaded images

RGB to Hex Converter

Convert RGB color values to hex codes

RGB to HSL Converter

Convert RGB colors to HSL format

RICE Score Calculator

Prioritize features using Reach, Impact, Confidence, Effort scoring

Log Retention Calculator

Calculate storage needs for log retention policies with compression estimates

SVG Path Length Calculator

Calculate path length for stroke-dasharray animations

IP to Binary Converter

Convert IPv4 addresses to binary and back with octet breakdown

UUID Bulk Generator

Generate large batches of UUID v4 or v7 values with export-ready formatting

Bundle Size Budget Planner

Plan and track your web application's bundle size budget across different chunks

Cookie Size Budget Calculator

Analyze cookie bytes, per-cookie limits, and request header budget usage

cURL to Code Converter

Convert curl commands to Python, JavaScript, Go, PHP, and more

JSON Tree Viewer

Visualize JSON as an interactive collapsible tree with search and path copying

CSS Grid Generator

Build CSS Grid layouts visually with live preview and code export

Dockerfile Generator

Generate production-ready Dockerfiles with best practices for any stack

.gitignore Generator

Generate .gitignore files for any language, framework, and IDE

Placeholder Image Generator

Generate custom placeholder images with specified dimensions, colors, and text

JSON to TypeScript Converter

Generate TypeScript interfaces and types from JSON objects automatically

Nginx Config Generator

Generate nginx server blocks for static sites, reverse proxy, SSL, and redirects

Image Metadata Viewer

View EXIF data and metadata from images - camera settings, GPS coordinates, date taken

Kano Model Mapper

Map features onto Kano categories using functional and dysfunctional questions with scatter plot visualization

Keyboard Tester

Test every key on your keyboard online - verify all keys register correctly

JavaScript Minifier

Minify JavaScript code by removing comments and whitespace to reduce file size

Htpasswd Generator

Generate .htpasswd entries for Apache HTTP basic authentication

.htaccess Generator

Generate .htaccess rules for redirects, caching, compression, and security headers

CSV Editor

Edit, sort, filter, and export CSV data in a spreadsheet view

JSON Flattener

Flatten nested JSON objects into dot-notation key-value pairs

JavaScript Formatter

Format and beautify JavaScript code with customizable indentation

Pixel to Rem Converter

Convert between px and rem units with customizable base font size

Cron Expression Generator

Build and decode cron expressions with a visual editor and next-run preview

IP Subnet Calculator

Calculate network address, broadcast, host range, and wildcard mask for any IPv4 subnet

JSON Path Finder

Paste JSON and click any value to get its JSONPath and dot notation path

UTM Link Builder

Build URLs with UTM tracking parameters

User-Agent Parser

Parse a user-agent string for quick details

URL Parser

Parse a URL into protocol, host, path, and query

Sitemap XML Generator

Generate a simple sitemap.xml from a list of URLs

Robots.txt Generator

Generate a robots.txt file with common rules

Meta Tag Generator

Generate common SEO meta tags for a page

SERP Preview Tool

Preview how your page appears in Google search results

HTTP Header Viewer

Paste and parse HTTP headers for inspection

CSS Unit Converter

Convert between px, rem, em, percent, vw, and vh

Color Contrast Checker

Check contrast ratio between two colors

Color Blindness Simulator

Simulate how images appear to people with color vision deficiency

Open Graph Preview

Preview how links appear on social media

Typography Scale Generator

Generate harmonious type scales with modular ratios

CSS Minifier

Minify CSS by removing comments and whitespace for smaller file sizes

Spacing System Calculator

Generate design system spacing scales with visual preview and export options

Hreflang Tag Generator

Generate hreflang link tags for multilingual SEO in HTML, XML sitemap, and HTTP header formats

Meta Title Description Length Checker

Check meta title and description length with live Google SERP preview

Robots.txt Tester

Test and validate robots.txt files with URL path checking

AI Token Counter

Estimate tokens and characters for a prompt

OpenAI Cost Calculator

Estimate API cost from token counts

OpenAI Token Counter

Count tokens and estimate costs for GPT-5.x, GPT-4o, and other OpenAI models

Claude Token Counter

Count tokens and estimate costs for Claude Opus 4.6, Sonnet, and Anthropic models

Gemini Token Counter

Count tokens and estimate costs for Google Gemini 3 Pro, 2.5 Pro and Flash models

Llama Token Counter

Count tokens and estimate costs for Meta Llama 4, 3.3, and open-source LLM models

Area Calculator

Calculate areas for common shapes

Circle Calculator

Calculate circle radius, diameter, circumference, and area

Pythagorean Calculator

Solve right triangles using a² + b² = c²

Triangle Calculator

Calculate triangle area and perimeter from side lengths

Volume Calculator

Calculate volume for common shapes

Aspect Ratio Visualizer

Visualize and compare aspect ratios for video, photography, and screens

Arc Length Calculator

Calculate arc length, sector area, and chord length from radius and angle

Hexagon Calculator

Calculate area, perimeter, diagonals, and inradius of a regular hexagon

Trapezoid Calculator

Calculate area, perimeter, height, and diagonals of a trapezoid

Surface Area Calculator

Calculate surface area for cubes, spheres, cylinders, cones, and more

Ohm's Law Calculator

Compute voltage, current, or resistance

Resistor Color Code Calculator

Decode 4, 5, and 6 band resistor color codes to find resistance values

Power Law Calculator

Compute electrical power from voltage and current

Power Factor Calculator

Calculate power factor, phase angle, reactive power, and estimated current

Force Calculator

Calculate force from mass and acceleration

Kinetic Energy Calculator

Calculate kinetic energy, mass, or velocity with unit conversions

Potential Energy Calculator

Calculate gravitational potential energy, mass, or height with unit and gravity presets

FOV Visualizer

Visualize and calculate field of view angles for cameras, games, and VR

Sun Angle & Shadow Calculator

Calculate solar altitude, azimuth, and shadow length for any location and time

Battery Runtime Calculator

Estimate battery life based on capacity, load, and safety factor

Voltage Divider Calculator

Calculate unloaded and loaded output voltage, divider current, and resistor power dissipation

Density Calculator

Calculate density, mass, or volume with common material presets

Half-Life Calculator

Calculate radioactive decay, remaining quantity, and elapsed half-lives

Projectile Motion Calculator

Calculate range, max height, and flight time of projectile motion

Ideal Gas Law Calculator

Solve PV = nRT for any variable with unit conversions

LED Resistor Calculator

Calculate the correct current-limiting resistor for LEDs with color code display

Moment of Inertia Calculator

Calculate moment of inertia for common shapes with parallel axis theorem

3D Print Time Estimator

Estimate 3D printing time based on model volume, layer height, print speed, and infill percentage

Wavelength Calculator

Convert between wavelength, frequency, and energy for electromagnetic waves with spectrum visualization

Stair Calculator

Calculate rise, run, number of steps, and code compliance for stairs

Torque Calculator

Calculate torque from force and lever arm distance with unit conversion

Spring Calculator

Calculate spring force, displacement, and energy using Hooke's Law

Pulley Calculator

Calculate mechanical advantage, belt length, and speed ratios for pulley systems

BTU Calculator

Calculate heating and cooling BTU requirements for any room

Pendulum Calculator

Calculate period, frequency, and length of a simple pendulum

Impedance Calculator

Calculate AC circuit impedance, reactance, and phase angle for RLC circuits

555 Timer Calculator

Calculate 555 timer IC frequency, duty cycle, and component values

Solar Panel Calculator

Estimate solar panel system size, costs, savings, and payback period for your home

HVAC BTU Calculator

Calculate heating and cooling BTU requirements for any room size

Pipe Flow Calculator

Calculate flow rate, velocity, and pressure drop in pipes

Air Conditioner Size Calculator

Calculate the right AC size in BTU for your room based on dimensions and conditions

Brick Calculator

Calculate how many bricks you need for a wall, patio, or project with mortar allowance

Staircase Calculator

Calculate stair dimensions — rise, run, number of steps, and stringer length

Battery Life Calculator

Calculate battery runtime from capacity and load, or required capacity for desired runtime

Air Density Calculator

Calculate air density from temperature, pressure, and humidity using the ideal gas law

Wire Size Calculator

Calculate the right wire gauge (AWG) for your electrical project based on current, distance, and voltage drop

Capacitor Charge Calculator

Calculate RC circuit charge/discharge time, time constant, and voltage curves

Snow Load Calculator

Calculate snow load on roofs and structures based on depth, density, and area

Voltage Drop Calculator

Calculate voltage drop across electrical wire runs based on wire gauge, length, current, and material

Rebar Calculator

Calculate rebar quantity, weight, and cost for concrete slabs, footings, and walls

Gear Ratio Calculator

Calculate gear ratios, RPM, and torque for single and multi-stage gear trains

Electrical Load Calculator

Calculate total electrical load, amperage, and recommended breaker size for panels and circuits

Noise Level Comparison Calculator

Compare noise levels in decibels, calculate combined sound sources, and understand hearing safety

Metal Weight Calculator

Calculate weight of metal stock by shape, dimensions, and material type

Torque Converter

Convert between torque units including N·m, ft·lb, in·lb, kgf·m, and more

Dipole Antenna Length Calculator

Calculate half-wave, quarter-wave, and 5/8-wave antenna lengths for any frequency

SWR Calculator

Calculate standing wave ratio, return loss, reflection coefficient, and mismatch loss

Decibel (dB) Calculator

Convert between dB and power or voltage ratios, dBm to watts, and add dB values

Coax Cable Loss Calculator

Calculate signal attenuation in coaxial cable by type, length, and frequency

Axle Weight Distribution Calculator

Calculate front and rear axle loads based on vehicle weight, wheelbase, and cargo position

Age Calculator

Calculate age from a birthdate

Date Difference Calculator

Calculate days between two dates

Time Zone Converter

Convert time between time zones

Time Zone Offset Visualizer

Visualize UTC offsets and time differences across multiple time zones

Working Days Calculator

Count business days between dates with holiday exclusions

Week Number Calculator

Find ISO week number for a date

Unix Timestamp Converter

Convert between Unix time and readable date

Date Add/Subtract Calculator

Add or subtract days, weeks, months from dates

Day of Week Calculator

Find what day any date falls on

Time Zone Overlap Finder

Find overlapping working hours across multiple time zones

Time Add/Subtract Calculator

Add or subtract time durations (hours, minutes, seconds) from a time

Weekend Days Between Dates

Count Saturdays and Sundays in any date range

Weekday Calculator

Find the day of the week for any date with holiday detection and calendar view

Square Footage Calculator

Calculate area in square feet from room dimensions for flooring, painting, and more

Tip Calculator

Calculate tip amount, total, and per-person split

Online Compass

Digital compass using your device's magnetometer sensor

Split Bill Calculator

Split a total evenly across a group

Receipt Total Calculator

Add line items, tax, discounts, tip, and split totals instantly

Shopping List Builder

Build a smart shopping list with quantities, categories, and budget tracking

Travel Packing List Generator

Generate a practical packing checklist by trip length, climate, activities, and bag type

Luggage Size Checker

Check if luggage dimensions meet airline carry-on and checked bag limits

Countdown Timer

Start a simple countdown timer in your browser

Stopwatch

Track elapsed time with a simple stopwatch

Pomodoro Timer

Focus timer with work and break intervals

Public Speaking Timer

Practice speech timing with visual warning cues and pacing checkpoints

Egg Timer

Perfect boiled eggs with presets for soft, medium, and hard

Time Until Calculator

Calculate time remaining until any date or event

Package Volume Calculator

Calculate package dimensions and shipping volume

Aspect Ratio Calculator

Calculate and visualize aspect ratios for images and video

Electricity Usage Calculator

Calculate electricity costs for appliances based on wattage, usage hours, and rate

Viewing Distance Calculator

Find the optimal TV, monitor, or projector viewing distance

Monitor Mount Checker

Check if a monitor mount supports your monitor based on size, weight, and VESA pattern

Barcode Generator

Generate EAN-13, UPC-A, and Code 128 barcodes

Barcode Scanner

Scan barcodes from photos or camera - reads EAN-13, UPC-A, Code 128, and more

QR Code Generator

Generate QR codes from text, URLs, and more

QR Code Camera Scanner

Scan QR codes using your device camera in real-time

QR Code Batch Generator

Generate multiple QR codes at once from a list of URLs or text

Phone Level & Inclinometer

Use your phone as a digital spirit level and angle meter

Slope Angle Measurement Tool

Measure slope angles using device sensors. Shows degrees, percentage grade, and rise:run ratio

Gravity Vector Visualizer

Visualize gravity direction with real-time accelerometer data

Vibration Frequency Analyzer

Measure vibration frequency using your phone's accelerometer

Camera Horizon Alignment Tool

Level your camera using device sensors for perfectly aligned photos

ImageCapture takePhoto() Demonstrator

Take full-resolution photos with the ImageCapture API, inspect PhotoCapabilities and all metadata

Simultaneous Audio + Photo Capture

Proof that browsers can record microphone audio and take full-resolution photos at the same time

Impact Acceleration Viewer

Measure and visualize impact forces and acceleration using your device's accelerometer

Fuel Economy Calculator

Calculate MPG or L/100km from distance traveled and fuel used

Gas Cost Calculator

Calculate trip fuel cost from distance, fuel efficiency, and gas price

EV Charging Cost Calculator

Estimate electric vehicle charging costs, charging time, and compare EV vs gas savings

Distance Time Speed Calculator

Solve for distance, speed, or time with unit conversion and trip pace insights

Electricity Cost Calculator

Estimate electricity costs for appliances by wattage and usage

Flashlight Screen Tool

Turn your screen into a bright flashlight with fullscreen color and strobe modes

Pie Chart Generator

Create customizable pie charts from your data with percentages and labels

Bar Chart Generator

Create customizable bar charts with horizontal or vertical orientation

Line Chart Generator

Create customizable line charts with multiple series and smooth or straight lines

Histogram Generator

Create histograms from numeric data with adjustable bins and statistics

Scatter Plot Generator

Create scatter plots from XY data with trend lines and correlation analysis

Size Comparison Visualizer

Visually compare dimensions of two objects side by side with accurate scaling

Gyroscope Drift Visualizer

See how your phone's gyroscope accumulates error over time

Line Straightness Visualizer

Test your display for distortion with straight line patterns

Pixel Density Visualizer

Calculate PPI from screen size and resolution

Screen Size Visualizer

Compare monitor, TV, and device screen sizes at scale

Screen Color Uniformity Test

Test display tint, banding, and brightness uniformity with fullscreen color patterns

Screen Ruler Calibration Tool

Calibrate your screen to display accurate physical measurements

Meeting Cost Calculator

Calculate the true cost of meetings based on attendees and duration

Perspective Distortion Checker

Overlay grid patterns on images to detect lens distortion and perspective issues

Edge Straightness Analyzer

Analyze edge straightness using device camera. Upload or capture an image, draw a line along an edge, and measure deviation from straight

Price Per Unit Calculator

Compare product prices across different sizes to find the best value

Unit Price Comparison Calculator

Compare 2-4 products by unit price with visual ranking, savings percentages, and instant best deal finder

Random Letter Generator

Generate random letters from A-Z, vowels, consonants, or custom sets

Image to PDF Converter

Convert images to PDF. Combine multiple JPG, PNG, or WebP images into a single PDF file.

Cable Length Estimator

Estimate required cable length with route style, slack, and standard size recommendations

Charging Time Estimator

Estimate battery charging time, wall energy use, and electricity cost from charge level, capacity, and charger power

Concrete Calculator

Calculate concrete volume, bag counts (40/60/80 lb), and cost for slabs, columns, footings, and walls

Concrete Block Calculator

Calculate blocks needed for walls, mortar quantity, number of courses, and estimated cost with waste factor

Tile Calculator

Calculate tile quantity, grout needed, and cost for floors, walls, and backsplashes with waste factor

Board Foot Calculator

Calculate board feet of lumber from thickness, width, and length with cost estimation

Lumber Calculator

Estimate lumber quantity and cost for framing, decking, or fencing projects from dimensions

Flooring Calculator

Calculate amount of flooring material needed for wood, laminate, or vinyl with waste factor and cost estimate

Paint Calculator

Calculate how much paint you need for walls and ceilings with door and window deductions

Gravel Calculator

Calculate gravel volume, weight, and cost for driveways, pathways, and landscaping projects

Fence Calculator

Calculate fence posts, rails, pickets, and concrete needed for your fence project

Drywall Calculator

Calculate drywall sheets, joint compound, tape, and screws needed for walls and ceilings

Decking Calculator

Calculate deck boards, joists, screws, and footings for your deck project

Email Signature Generator

Create professional HTML email signatures with live preview and one-click copy

Typing Speed Test

Test your typing speed (WPM) and accuracy with detailed statistics

Email Signature Generator

Create professional HTML email signatures for Gmail, Outlook, and Apple Mail

Window Blind Size Checker

Check if blinds fit your window dimensions for inside or outside mount

Audio Motion Correlation Visualizer

Visualize correlation between audio input and device motion in real-time

World Clock

View current time in multiple cities and time zones simultaneously

Invoice Generator

Create professional invoices with line items, tax, and print support

Insulation Calculator

Calculate insulation R-value requirements, materials, and costs

Wallpaper Calculator

Calculate how many rolls of wallpaper you need for any room with pattern repeat support

Carpet Calculator

Calculate carpet square footage, rolls, and cost for any room

Carbon Footprint Calculator

Estimate your annual CO2 emissions from transportation, energy, food, and shopping

Dew Point Calculator

Calculate dew point from temperature and humidity with comfort level indicator

Heat Index Calculator

Calculate feels-like temperature from air temperature and humidity

Temporary Notes App

Quick disposable notepad for scratch notes that auto-delete when you close the tab

Tire Size Calculator

Compare tire sizes and calculate speedometer differences

TV Size Distance Calculator

Find the ideal TV size for your viewing distance or optimal distance for your TV

Pet Food Portion Calculator

Calculate daily food portions for dogs and cats by weight and activity level

Fuel Cost Calculator

Estimate fuel costs for trips and commutes with vehicle comparison and efficiency tips

Roof Pitch Calculator

Calculate roof pitch, slope angle, rafter length, and area multiplier with material recommendations

Pool Volume Calculator

Calculate pool water volume in gallons and liters for chemical treatment, filling time, and heating costs

Wind Chill Calculator

Calculate wind chill temperature and frostbite risk from temperature and wind speed

Gas Mileage Calculator

Calculate fuel efficiency, trip fuel costs, and compare vehicle gas mileage

Tip Split Calculator

Split restaurant bills with tip among any number of people

Deck Cost Calculator

Estimate deck building costs by size, material, and features

Mulch Calculator

Calculate how much mulch you need in cubic yards and bags for your garden beds

Electric Bill Calculator

Estimate your monthly electricity bill from appliance usage and rate

Aquarium Volume Calculator

Calculate aquarium water volume and weight for rectangular, bow-front, and cylindrical tanks

Lawn Fertilizer Calculator

Calculate how much fertilizer to apply based on lawn size, grass type, and NPK ratio

Paver Calculator

Calculate how many pavers you need for a patio, walkway, or driveway with base material

Color Temperature Converter

Convert Kelvin color temperature to RGB values with visual preview and lighting presets

Oven Temperature Converter

Convert between Fahrenheit, Celsius, and Gas Mark for cooking with common baking temperature presets

Shoe Size Converter

Convert between US, UK, EU, and CM/JP shoe sizes for men, women, and children

Rain Barrel Calculator

Calculate rainwater harvest potential from your roof area and local rainfall

Appliance Energy Calculator

Calculate electricity costs for any household appliance based on wattage and usage

Bathroom Remodel Cost Calculator

Estimate bathroom renovation costs by size, fixtures, and finish level

Land Area Calculator

Calculate land area in acres, hectares, square feet, and square meters for any shape

Water Heater Cost Calculator

Calculate annual water heating costs and compare gas vs electric vs tankless

Cubic Yard Calculator

Calculate cubic yards for landscaping, concrete, gravel, mulch, and other materials

Asphalt Calculator

Calculate hot mix asphalt tonnage and cost for driveways, parking lots, and road paving projects

Post Hole Calculator

Calculate concrete bags and gravel needed for fence and deck post holes

Siding Calculator

Calculate siding materials, panels, trim, and cost for home exterior projects with window and door deductions

Retaining Wall Calculator

Calculate blocks, gravel, base material, and cost for building a retaining wall

Septic Tank Size Calculator

Determine the right septic tank size based on bedrooms, occupants, water usage, and soil type

Concrete Stair Calculator

Calculate concrete volume, step dimensions, and building code compliance for concrete stairs

Window Replacement Cost Calculator

Estimate window replacement costs by type, frame material, glass, and installation with energy savings analysis

Heat Pump Calculator

Size heat pumps and compare energy costs vs gas furnace, electric resistance, and oil heating systems

Concrete Volume Calculator

Calculate concrete volume for slabs, columns, triangles, and curbs with bag estimates and cost

Lawn Care Calculator

Calculate seed, water, mowing, and top dressing needs for lawn care based on grass type and lawn size

Dog Food Calculator

Calculate daily food portions for dogs based on weight, age, activity level, and food type

Wire Length Calculator

Calculate electrical wire length needs with voltage drop analysis and NEC compliance checking

Bathroom Tile Calculator

Calculate tiles, grout, and thinset needed for bathroom floors, walls, and showers with cost estimation

Water Bill Calculator

Estimate your monthly water bill with tiered pricing, sewer charges, and usage comparison

Paint Mixing Ratio Calculator

Calculate paint mixing ratios for automotive, industrial, and art applications with batch scaling

Concrete Patio Calculator

Calculate concrete volume, bags, rebar, and cost for patios in rectangle, circle, and L-shapes

Rain Gutter Calculator

Calculate gutter size, downspouts, brackets, and materials needed for your roof drainage system

Sourdough Bread Calculator

Calculate baker's percentages, hydration, starter feeding, and baking timeline for sourdough bread

Concrete Driveway Calculator

Calculate concrete volume, bags, and cost for driveway projects

Concrete Footing Calculator

Calculate concrete volume, bags, and cost for continuous, pier, and spread footings

Window AC Size Calculator

Find the right BTU window air conditioner for your room size and conditions

Sod Calculator

Calculate sod rolls, pallets, and cost for rectangular, circular, or irregular lawns

Paint Drying Time Calculator

Estimate paint drying and curing times based on paint type, temperature, and humidity

Water Softener Calculator

Size a water softener based on hardness, household size, and water usage

Gutter Size Calculator

Calculate gutter and downspout sizes based on roof area, pitch, and rainfall intensity

Floor Tile Calculator

Calculate tiles needed for any room with grout gap, waste factor, and cost estimation

IBU Bitterness Calculator

Calculate International Bitterness Units for homebrewing using the Tinseth formula

Priming Sugar Calculator

Calculate priming sugar amounts for bottle conditioning beer with residual CO2 correction

Hydrometer Temperature Correction

Correct hydrometer specific gravity readings for temperature variations

Mash Water Calculator

Calculate strike water volume and temperature for all-grain brewing

Anagram Checker

Check if two words or phrases are anagrams

Word Counter

Count words, characters, and sentences

Keyword Density Calculator

Analyze keyword frequency and density for SEO

Text Case Converter

Convert text to upper, lower, title, or sentence case

Slug Generator

Turn text into a clean URL slug

Reading Time Estimator

Estimate reading time from word count

Email Address Extractor

Extract email addresses from text

Character & Word Counter

Count characters, words, lines, and paragraphs

Text Reverser

Reverse text by characters, words, or lines

Lorem Ipsum Generator

Generate placeholder lorem ipsum text

URL Encoder/Decoder

Encode or decode URL components

Text Diff Tool

Compare two texts line by line

Emoji Counter

Count emojis in text and see most frequently used

Instagram Bio Line Break Tool

Format Instagram bio with proper line breaks

TikTok Hashtag Generator

Generate trending TikTok hashtags by niche

Duplicate Line Remover

Remove duplicate lines from text instantly

Duplicate Word Remover

Remove repeated words from text while keeping order

Line Numberer

Add line numbers to text with customizable formatting

Text to Binary Converter

Convert text to binary and binary to text

Word Frequency Counter

Count word frequency and find most common words

Palindrome Checker

Check if text reads the same forwards and backwards

Mocking Text Generator

Generate SpongeBob-style alternating caps mocking text

Whitespace Cleaner

Clean extra spaces, normalize line breaks, and trim whitespace

Base64 Encoder/Decoder

Encode text to Base64 or decode Base64 to text

Syllable Counter

Count syllables in words and text for poetry and writing

Paint Coverage Calculator

Calculate how much paint you need for walls, ceilings, or rooms based on dimensions and coverage rate

Conversion Rate Calculator

Calculate conversion percentage from visitors

CPM Calculator

Calculate cost per thousand impressions

ROAS Calculator

Calculate return on ad spend

Customer Lifetime Value Calculator

Calculate LTV and LTV:CAC ratio

Churn Rate Calculator

Calculate customer churn and retention rates

CAC Calculator

Calculate customer acquisition cost

CAC Payback Period Calculator

Calculate how long to recover customer acquisition cost

Freelance Rate Calculator

Calculate freelance hourly and project rates

Invoice Generator

Create professional invoices with line items, tax, and discounts

A/B Test Duration Estimator

Estimate how long to run an A/B test for statistical significance

Average Order Value Calculator

Calculate AOV from revenue and orders

Bounce Rate Calculator

Calculate bounce rate with industry benchmarks

CPC Calculator

Calculate cost per click from ad spend and clicks

Email Open Rate Calculator

Calculate email open rate with industry benchmarks

Email Click-Through Rate Calculator

Calculate email CTR with industry benchmarks and optimization insights

Retention Rate Calculator

Calculate customer retention rate over any time period

Cart Abandonment Rate Calculator

Calculate shopping cart abandonment rate and lost revenue

Session Duration Calculator

Calculate average session duration and engagement metrics

Conversion Funnel Calculator

Analyze multi-step funnel conversion rates and drop-off points

Risk Matrix Generator

Create likelihood vs impact matrices to assess and prioritize project risks

Blog Title Generator

Generate SEO-optimized blog titles and headlines

Price Elasticity Calculator

Calculate price elasticity of demand and analyze how price changes affect revenue

Employee Turnover Cost Calculator

Calculate the true cost of employee turnover including recruiting, training, and lost productivity

CSAT Score Calculator

Calculate Customer Satisfaction Score from survey responses with rating breakdown and benchmarks

Box Dimension Visualizer

Visualize a 3D box with dimensions, volume, and surface area calculations

Weight Comparison Visualizer

Compare weights visually using familiar reference objects

Container Volume Visualizer

Visualize and compare container volumes with fill-level calculations

Decision Tree Visualizer

Create interactive decision trees with automatic layout and SVG export

Room Layout Visualizer

Plan your room layout with drag-and-drop furniture placement in 2D top-down view

Color Scheme Generator

Generate harmonious color schemes from any base color

Electricity Rate Comparison Calculator

Compare electricity plans and rates side by side to find the cheapest option

Rug Size Calculator

Find the perfect rug size for any room with visual placement preview and sizing recommendations

Fence Cost Calculator

Estimate total materials, labor, and project cost for building a fence

Firewood Calculator

Estimate how much firewood you need for a heating season with cost and storage calculations

Seed Spacing Calculator

Calculate optimal seed spacing and quantity for garden beds with visual grid preview

Snow Removal Cost Calculator

Estimate snow removal costs for driveways, sidewalks, and parking lots by method and frequency

Ice Melt Calculator

Calculate how much ice melt or deicer you need for driveways, sidewalks, and walkways

Fabric Calculator

Calculate how much fabric you need for sewing projects like curtains, quilts, tablecloths, and clothing

Curtain Size Calculator

Find the perfect curtain width, length, and number of panels for any window

Window Blinds Calculator

Calculate the right size and estimated cost for window blinds and shades

Rent Receipt Generator

Generate printable rent receipts for landlords and tenants