Pick the calculation you need from the dropdown, enter the two numbers, and the result updates as you type.
For worked examples of each calculation type, see the percentage calculator step-by-step guide.
Percentage Calculator
Work out a percentage of a number, the reverse (what percent one number is of another), or a percent change. Pick the calculation you need from the dropdown, enter the two numbers, and the result updates as you type - no button to click.
Use it for a discount, a tax add-on, a grade, or comparing two values as a percent change.
Switch calculations at any time; the two number fields carry over so you can compare results without re-typing them.
The calculation runs locally in the browser - no upload and no account. Nothing you type is stored beyond the page session or sent to an analytics or tracking service.
The result is a general estimate, not financial or professional advice.
Frequently Asked Questions
What does Percentage Calculator do?
Work out a percentage of a number, the reverse (what percent one number is of another), or a percent change.
When should I reach for percentage calculator?
Use it for a discount, a tax add-on, a grade, or comparing two values as a percent change.
What complementary tools work well alongside percentage calculator?
Switch calculations at any time; the two number fields carry over so you can compare results.