All Tools VersePercentage Calculator - Percent and Change
Calculate percentages: X% of Y, X is what % of Y, % change. Free tool.
- Runs in your browser
- Nothing uploaded
- Free, no sign-up
Work out a percentage of a number, what percent one value is of another, a percentage change, or reverse a percentage, all in one place. Everything updates instantly in your browser.
How to Use Percentage Calculator - Percent and Change
- Pick what to work out. Choose a percent of a number, what percent one value is of another, a percentage change, or a reverse percentage.
- Enter your two numbers. The labels change to match the mode you picked.
- Read the result. The answer shows at the top with a plain-language sentence and the exact formula used.
- See it visually. A chart shows the part against the whole, or the change from one value to another.
- Save it. Print a clean copy or copy a share link with your numbers.
Frequently Asked Questions
How do I find a percentage of a number?
Multiply the number by the percent and divide by 100. For example, 25 percent of 200 is 200 times 25 divided by 100, which is 50.
How do I find what percent one number is of another?
Divide the first number by the second and multiply by 100. For example, 50 out of 200 is 50 divided by 200 times 100, which is 25 percent.
How is percentage change calculated?
Subtract the old value from the new value, divide by the old value, and multiply by 100. A positive result is an increase, a negative one is a decrease.
What is a reverse percentage?
It finds the original whole when you know a part and its percentage. If 30 is 25 percent of a number, the number is 30 divided by 0.25, which is 120.
Is my information sent anywhere?
No. Everything runs in your browser. Your numbers never leave your computer and it works offline once loaded.
Can I use decimals?
Yes. You can enter decimal numbers and percentages, and the result keeps full precision.
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