Percentage Calculator
Pick the question you are actually asking, type two numbers, and get the answer with the formula and the working shown. No sign-up, and everything runs in your browser.
The six percentage questions
Almost every percentage problem is one of six shapes. The tabs above switch between them: a percent of a number, one number as a percent of another, the change between an old and a new value, a value increased or decreased by a percent, and the difference between two values where neither is the original. Picking the right shape matters more than the arithmetic — a 25% increase followed by a 25% decrease does not bring you back to the start, because the second percent is measured against a different base.
Dedicated calculators
Growth from an old value to a new one, as a percent.
Decline from an old value to a new one, as a percent.
Increase or decrease — one tool, signed result.
Compare two values against their average.
Sale price and total savings, including stacked discounts.
Turn a score out of a total into a percentage.
Fractions and decimals converted to percentages.
The three basic problem types, explained with examples.
Popular questions, answered
What is 10% of 100? · What is 15% of 200? · What is 20% of 50? · What is 20% of 100? · What is 25% of 200? · What is 30% of 500? · What is 15% of 100? · What is 5% of 1000?