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Percentage Calculator
Calculate percentages, increases, decreases and ratios — free, instant, entirely in your browser.
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Three common percentage problems
Most percentage questions fall into one of three types: finding a percentage of a number, finding what percentage one number is of another, or finding the percentage change between two numbers. This calculator handles all three from one place.
Frequently asked questions
Divide X by Y and multiply by 100. The "X is what % of Y" tab does this calculation for you automatically.
Percentage increase is calculated as (new value − old value) ÷ old value × 100.