Clean, fast tools for everyday calculations. No tracking, no sign-up. Everything runs in your browser.
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Popular Tools
Percentage Calculator
Calculate percentages and percent change
BMI Calculator
Calculate Body Mass Index
Weight & Mass Converter
Metric and imperial weight units
Length Converter
Convert between metric and imperial length units
Loan Calculator
Estimate monthly payments and interest
Currency Converter
Convert currency with a manual rate
Word Counter
Count words, characters, and sentences
Cron Schedule Validator
Validate and explain cron expressions
Browse by Category
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