Every % question · live

🧮 Percentage Calculator

Five everyday percentage questions — type numbers, read the answer instantly: X% of Y, what percent, percent change, increase/decrease and rule of three.

% ofis

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is what % of?

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Fromtochanges by

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% becomes

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Rule of three

goes with, thengoes with

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Numbers accept thousands separators (comma or dot) and decimals. Everything updates as you type; click ⧉ to copy a result. Rule of three: “proportional” scales up together (3 kg → 270k then 7 kg → 630k); “inverse” scales opposite (3 workers → 8 days then 6 workers → 4 days).