Percentage Calculator
Calculate percentages instantly — find X% of Y, percentage increase/decrease, and what percent X is of Y. Free, no signup required. Runs in your browser.
What is Percentage Calculator?
The Percentage Calculator covers the three most common percentage problems in one place: finding what X% of a number is, calculating the percentage change between two values, and figuring out what percentage one number is of another.
Percentage calculations come up constantly — discounts, tax, tips, grade curves, financial growth, data analysis. Instead of reaching for a spreadsheet or doing it by hand, just type in your numbers and get the answer instantly.
All calculations run in your browser with no server involved. Your numbers never leave your device, making this safe for sensitive financial, academic, or business calculations. No account is required, and there are no usage limits.
How to use
Frequently asked questions
Multiply Y by X and divide by 100. For example, 20% of 150 = 150 × 0.20 = 30.
Subtract the old value from the new value, divide by the old value, then multiply by 100. A result above 0 is an increase, below 0 is a decrease.
Divide X by Y and multiply by 100. For example, 30 is what % of 150? 30/150 × 100 = 20%.
Yes. All calculations happen locally in your browser. No numbers or inputs are sent to any server.