🔢 Math

Mathematics Calculators

Free tools for statistics, percentages, random numbers, geometry and number theory. All calculations run instantly in your browser.

Core Tools
%
Percentage Calculator
5 types: X% of Y, what %, % change, add/subtract % from number.
5 problem types
 Stats
Statistics Calculator
Mean, median, mode, standard deviation, variance, quartiles, IQR and histogram.
Full descriptive stats
 Random
Random Number Generator
Any range, multiple unique numbers, quick picks for dice, lotto and coin flip.
Web Crypto API
 Numbers
Prime Number Checker
Check if prime, get full factorization, all divisors and nearest primes.
Factorization · Divisors
 Numbers
Number Base Converter
Binary, octal, decimal, hex, base 32 and 36 - instant conversion with reference table.
Binary · Hex · Octal
 Geometry
Pythagorean Theorem
Solve any side, angle, area and perimeter of a right triangle from two sides.
a² + b² = c²
Statistics & Probability
Stats
Chi-Square Calculator
Goodness of fit test with χ² statistic, p-value, critical value and step-by-step.
p-value · Step-by-step
 Random
Dice Roller
D4-D100 with 3D animation, player scoring and roll history.
3D · Players · History
 Utility
Password Generator
Secure random passwords with strength meter and copy button.
Strength meter
Calculators
Calc
Scientific Calculator
Full scientific functions: trig, log, powers, memory and constants.
Full function set
 Calc
Basic Calculator
Standard arithmetic with keyboard support and calculation history.
Keyboard support