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.
No. The result is shown to full precision using your browser's number formatting. Round it yourself if you need a specific number of decimal places.
Last updated 2026-06-03.