What is the Percentage Calculator?
Work out percentages three ways: a percentage of a number, one number as a percentage of another, and percentage change.
Enter i want to find, x and y and the Percentage Calculator returns answer and working. Results update as you type, and nothing you enter leaves your device.
How it is calculated
How to use it
- Choose i want to find.
- Enter x.
- Enter y.
- Read answer in the results panel. It updates as you type.
- Change any value to compare scenarios, or use Share to send the result as a link.
Worked example
Common questions
How do I calculate a percentage of a number?
Divide the percentage by 100 and multiply by the number. For example, 15% of 200 is 15 ÷ 100 × 200 = 30.
How do I find what percent one number is of another?
Divide the first number by the second and multiply by 100. For example, 45 out of 60 is 45 ÷ 60 × 100 = 75%.
What formula does the Percentage Calculator use?
It uses: X% of Y = X ÷ 100 × Y; X as a percentage of Y = X ÷ Y × 100; Percentage change = (Y − X) ÷ |X| × 100.
What do I need to use the Percentage Calculator?
You need i want to find, x and y. Sensible starting values are filled in so you can see how it works straight away.
Is the Percentage Calculator free, and is my data stored?
It is free with no sign-up. The calculation runs in your browser, so the values you enter are not sent to or stored on our server.