buncha/finance/percent

Percentage Calculator

e.g. What is 15% of 200 = 30

Percentage (%)

Number

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About Percentage Calculator

Calculate percentages, increases, decreases, and percentage changes. Five modes: X% of Y, X is what % of Y, % change from X to Y, increase by, decrease by.

Percent maths trips up everyone occasionally — especially the difference between 'increase by 20%' (×1.2) and '20% off' (×0.8). The five modes cover every variation explicitly so you don't have to remember which formula to use.

The Quick Reference grid (when computing X% of Y) shows you the value at 5%, 10%, 15%, ..., 100% — useful for tipping, tax estimation, and discount comparisons.

Like every tool on Buncha, this one runs entirely in your browser. There's no upload, no log, no record of what you've pasted or generated. Close the tab and the data is gone.

↳ Have feedback or found a bug? hello@buncha.tools