Calculate circle area and circumference
Work out how many ways you can choose r items from n, with order (nPr) and without (nCr). Exact for large values, with the factorials shown and lottery and card presets.
Calculate any number raised to a power
Calculate with two fractions and get the answer in lowest terms, as a mixed number and as a decimal. Also converts a decimal back to the simplest fraction that matches it.
Find the Greatest Common Divisor of any set of numbers
Find the Least Common Multiple of any set of numbers
Calculate percentages, percentage changes, and increases. Free math calculator for discounts, tips, taxes, and everyday calculations.
Break any number into its prime factors, in exponent form and written out. Shows how many divisors the number has and whether it is prime.
Calculate the missing side of a right triangle
Solve quadratic equations using the quadratic formula
Calculate rectangle area and perimeter
Convert any number from 1 to 3999 into Roman numerals, or read a numeral back into a number. Rejects non-standard forms like IIII and IC, and lists the seven symbols with the values people look up most.
Calculate square area and perimeter
Calculate triangle area and perimeter