Math Tools
Statistics, primes, GCD/LCM, equations and more.
9 free tools · updated regularly
Scientific Calculator
Evaluate expressions with trig, logarithms, square roots, powers, π and e — type or tap.
Open tool →Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals back to numbers instantly (1–3999).
Open tool →Fraction Calculator
Add, subtract, multiply and divide fractions and get the answer simplified, with a decimal equivalent.
Open tool →Number to Words Converter
Spell any number in English — including decimals and negatives — ready to copy.
Open tool →Quadratic Equation Solver
Find the roots, discriminant and vertex of any quadratic equation using the quadratic formula.
Open tool →GCD & LCM Calculator
Find the greatest common divisor and least common multiple of two or more numbers instantly.
Open tool →Prime Number Checker
Find out instantly if a number is prime, see its prime factorization, and get the next prime.
Open tool →Standard Deviation Calculator
Compute sample and population standard deviation, variance and mean from your data set instantly.
Open tool →Average Calculator
Find the mean, median, mode, sum, range, min and max of any list of numbers instantly.
Open tool →About Math Tools
Math helpers for statistics, number theory and algebra — averages, standard deviation, prime checking, GCD/LCM, quadratic equations and number-to-words. Instant and client-side.