Free online percentage calculator with 4 modes: what is X% of Y, X is what % of Y, percentage change, and percentage difference. Instant results, pure client-side.
A clean, fast percentage calculator for everyday math. Supports four common percentage calculation modes: percentage of a number, what percent one number is of another, percentage change, and percentage difference. All calculations happen instantly in your browser — no server, no delay, no data sent anywhere.
Yes, completely free. No registration, no ads, no limits.
Select "Percentage change from X to Y" mode, enter the original value as X and the new value as Y. The result shows the percentage increase or decrease.
Yes, all modes support negative numbers and decimals.
Absolutely. All calculations happen inside your browser. Nothing is sent to any server.