Math
Average CalculatorPaste a list of numbers to get the mean, median, mode, range, count and sum at once. Switch to weighted mode for grades or prices with different weights.Ratio CalculatorSolve for the missing value in a proportion, simplify a ratio to its lowest terms, or scale it up and down. Works with decimals and screen sizes like 1920:1080.Standard Deviation CalculatorPaste a list of numbers to get the sample and population standard deviation, variance, mean and count, plus a step-by-step table of deviations.Rounding CalculatorRound any number to a set number of decimal places, to the nearest 10 or 100, or to significant figures. Choose half up, half even, round up, round down or truncate.Probability CalculatorFind the probability that two independent events both happen, either happens, or neither does. Also works out the chance of at least one success in n tries.Square Root CalculatorFind the square root, cube root or any nth root of a number. Simplify radicals such as √72 = 6√2 and check whether a number is a perfect square.Circle CalculatorEnter any one of radius, diameter, circumference or area and get the other three instantly. Results are shown to the precision you choose, with exact answers in terms of π.
Free math tools: Average Calculator, Ratio Calculator, Standard Deviation Calculator, Rounding Calculator, Probability Calculator, Square Root Calculator, Circle Calculator. Each one runs in your browser, shows the result as you type, and sends nothing to a server.