Percentage Calculator
Three percentage tools in one: find X% of a number, work out what percent one value is of another, or calculate the percentage change between two numbers.
Pick a mode — 'X% of a number', 'X is what percent of Y', or 'percentage change from A to B' — enter the two values, and the answer appears instantly. It runs entirely in your browser.
Zero Server Uploads
Files process in local RAM
Instant WASM Speed
No waiting queues or lags
Unlimited Batching
Convert files without limits
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How to use Percentage Calculator
- 1Choose the type of percentage calculation.
- 2Enter the two numbers.
- 3Read the result instantly.
The three most common percentage questions
'What is 15% of 200?' (a percentage of a number), '30 is what percent of 200?' (a ratio as a percent), and 'what's the change from 200 to 250?' (percentage increase or decrease) — this tool answers all three without any formulas to remember.
Frequently Asked Questions
How do I calculate percentage change?
Percentage change = (new − old) ÷ |old| × 100. A rise from 200 to 250 is a +25% change.
Is this free?
Yes — free, no sign-up, and it runs in your browser.