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Percentage Calculator
Calculate percentage of a number, percentage change, what percent X is of Y, and work backward from a percentage — all in one tool.
What is X% of Y?
Privacy Note
All calculations run locally in your browser. No data is sent to any server.
Frequently Asked Questions
Use the "Percentage Of" mode. Enter 20 in the percentage field and your number in the value field. The result is (20 / 100) × value. For example, 20% of 500 = 100. You can also do this mentally by dividing by 5.
Use the "Percentage Change" mode. Enter the original (From) value and the new (To) value. The formula is ((To - From) / |From|) × 100. A positive result is a percentage increase; a negative result is a decrease.
It means finding the original value when you know a percentage result. For example, if $75 is 25% of some original price, the original was $300. This is useful for finding pre-discount or pre-tax prices.
Use "What %" mode. Enter the part and the whole. The result is (part / whole) × 100. For example, 25 out of 200 is 12.5%.
Yes, completely free. It runs in your browser with no account, no subscription, and no data sent to any server.
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