Percentage Calculator

Three questions, three boxes. Fill in whichever one you came for.

This tool needs JavaScript

The tool runs in your browser, so nothing can be calculated with JavaScript turned off. The rest of the page is still readable.

What is a percentage of a number?

Percent Of

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What percentage is one of another?

This number Out of

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What is the percentage change?

Old value New value

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One note

Percentage change is measured against the old value: 250 to 300 is a 20% rise, while 300 to 250 is a 16.67% fall. Same difference, different percentage. If the old value is zero the change is undefined and nothing is shown. Everything is worked out in your browser.