Percentage Calculator

Calculate X% of a number, what percentage one number is of another, and the percentage change between two values — with results as you type.

This tool runs entirely in your browser.

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How to use the Percentage Calculator

1Choose the type of calculation.
2Enter the two numbers.
3Read the result — it updates as you type.

What is the Percentage Calculator?

X% of Y = Y × X ÷ 100. For example, 20% of 150 is 150 × 20 ÷ 100 = 30.

X as a percentage of Y = X ÷ Y × 100. Percentage change from X to Y = (Y − X) ÷ |X| × 100.

Frequently asked questions

How do I calculate 15% of 80 in my head?

10% of 80 is 8 and 5% is half of that (4), so 15% is 8 + 4 = 12.

Is the Percentage Calculator free and private?

Yes. The Percentage Calculator is free, needs no account, and runs entirely in your browser. What you type is never sent to a server or stored.

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