Math & Statistics
Fractions, factorization, statistics, geometry and number conversions.
The Math & Statistics collection covers classroom and everyday math: fraction arithmetic, prime factorization, GCD and LCM, mean/median/mode, standard deviation, combinations and permutations, the Pythagorean theorem and scientific notation.
Each calculator shows its work and formulas so you can learn as you compute. Everything runs locally in your browser — free, instant and private.
All math & statistics
Roman Numeral Converter
Convert numbers to Roman numerals and back — 1 to 3999.
MathFraction Calculator
Add, subtract, multiply and divide fractions — always simplified.
MathPrime Factorization Calculator
Break any number into its prime factors with exponents.
MathGCD and LCM Calculator
Greatest common divisor and least common multiple of any numbers.
MathMean Median Mode Calculator
Average, middle value and most frequent — the statistics trio in one view.
MathStandard Deviation Calculator
Sample and population standard deviation, variance and mean from any dataset.
MathPermutation and Combination Calculator
Count arrangements (nPr) and selections (nCr) instantly.
MathPythagorean Theorem Calculator
Find the missing side of any right triangle — a² + b² = c².
MathScientific Notation Converter
Convert between decimal, scientific and engineering notation.
Looking for something else? Browse the other free tool collections: Financial Calculators · Date & Time Tools · Unit Converters · Developer Tools · Text Tools · File & Image Tools · Health & Fitness Calculators · Everyday Tools · Fun & Generators.