Free tools for math calculations and conversions. All tools run in your browser with no data sent to any server.
All Math 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