Percentage Calculator
Solve common percentage problems quickly.
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Frequently asked questions
Three: "what is X% of Y" (the most common), "X is what percent of Y" (turning two numbers into a ratio), and "percent change from X to Y" (how much did the value go up or down). Switch modes with the toggle at the top.
It is (new − old) / old × 100. A positive number means the value increased; a negative number means it decreased. The calculator returns 0 when the starting value is zero, since dividing by zero is undefined.
Yes, slightly. The result is shown to about 3 decimal places using your browser's number formatting. Round it further yourself if you need a specific number of decimal places.
Last updated 2026-06-03.