Percentage calculator
Pick the calculator that matches your question and type the numbers. Each answer updates as you type and shows the formula it used.
What is X percent of Y?
X is what percent of Y?
Percentage change from X to Y
Stays on your device
Nothing you type is sent
Works as you type
No file needed
Copy or download
Nothing is saved
How it works
- Choose one of the three calculators on the page.
- Type your numbers. The answer updates as you type.
- With the percent change formula, the answer also says whether it is an increase or a decrease.
- Read the formula under the answer to see how it was worked out.
Facts
- Where it runs
- In your browser. What you type is not sent anywhere or saved
- Percent of
- X percent of Y is X ÷ 100 × Y
- Share
- X as a percent of Y is X ÷ Y × 100
- Change
- Change from X to Y is (Y − X) ÷ X × 100, and the answer says whether it is an increase or a decrease
- Decimal mark
- A comma can be used as the decimal mark
Questions
How do I work out a percentage of a number?
Use the first calculator. Type the percent and the number, and the answer appears. The formula is X ÷ 100 × Y.
How do I find what percent one number is of another?
Use the second calculator. Type the part and the whole, and the answer uses the formula X ÷ Y × 100.
How is percentage change calculated?
Subtract the starting number from the new number, divide by the starting number, and multiply by 100. The formula is (Y − X) ÷ X × 100.
Can I use a comma in the numbers?
Yes. A comma can be used as the decimal mark, so 2,5 is read as 2.5.