Math Calculators

Work out a free throw percentage from makes and attempts — the standard shooting stat for basketball, with the miss percentage shown alongside. The same formula works for field goal percentage, three-point percentage, or any made-versus-attempted rate.

Work out the annual rate at which an economy has grown, from GDP at the start and end of a period.

Work out GDP per capita — the headline measure of average economic output per person, and the figure most often cited when ranking countries by economic standard of living.

Work out the percent error between a measured value and the accepted true value — the headline accuracy metric in chemistry labs, physics experiments, and engineering tolerances.

Work out a percentage of any number — the everyday calculation behind tips, discounts, scores, and shares of a total.

Calculate the percentage change between two numbers — how much a value has risen or fallen relative to where it started.

Calculate the percentage decrease from an original value to a lower one — how much something has fallen relative to where it began.

Calculate the percentage increase from an original value to a higher one — how much something has grown relative to where it began.

Work out how fast a population is changing by reducing two census counts to a single annual growth rate.

Work out the percentage of a rent increase by comparing your current rent with the new amount a landlord is proposing.

Work out the percentage of a pay raise by comparing your current salary with the new one — the figure that shows how much your pay has really grown.

Find what percent one number is of another — the everyday question behind grades, shares, and any part-of-a-total comparison.

Work out a win percentage from games won and games played — the standard measure of how a team or player is performing.