Math Calculators

Find a percentage of a number, percentage change, and what percent one number is of another.

Calculate your grade point average from your course grades and credit hours on the standard 4.0 scale, with your total quality points.

Find your weighted course grade from assignment scores and weights, or the score you need on the final to hit your target.

Add, subtract, multiply and divide fractions with simplified results and decimals.

Calculate mean, variance and standard deviation for a data set (sample or population).

Convert numbers to Roman numerals and Roman numerals back to numbers instantly.

Simplify a ratio to its lowest terms or solve a proportion for the missing value, with the equivalent decimal and percentage shown too.

Find the mean, median, mode, range and sum of any set of numbers at once — just paste your values and get every average instantly.

Compare products by price per unit and see which one is the better deal, plus how much you save.

Find the hypotenuse or a missing leg of a right triangle with a² + b² = c².

Find the distance, midpoint and slope between two points on a coordinate plane.

Solve any quadratic equation ax² + bx + c = 0 for real or complex roots, with the discriminant and the step-by-step quadratic formula.

Find the least common multiple and greatest common divisor of two or more numbers.

Convert numbers to and from scientific notation and see the expanded form.

Calculate permutations (nPr), combinations (nCr) and factorials for any n and r, with the formulas and exact results — ideal for probability and stats.

Count the ways to partition n objects into k groups (Stirling numbers of the second kind) and into any number of groups (Bell number).

Break a number into its prime factors, list all its divisors, and check whether it is prime.

Write any number in words — including decimals and a cheque-style amount for USD.