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Percentage Calculator

Calculate any percentage problem quickly. Find what X% of Y is, add or subtract a percentage, and work out increases or decreases on the fly.

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About the Percentage Calculator

Content reviewed 6 August 2026

Percentages sit behind almost every business decision β€” a discount, a markup, a growth number, a GST rate. This calculator handles the everyday cases in one place: X% of Y, adding or subtracting a percentage, and the change between two numbers.

It's built for speed: type the numbers, get every common percentage answer at once, without hunting for the right formula.

Frequently asked questions

How do I find what percentage one number is of another?+

Divide the part by the whole and multiply by 100. 30 out of 150 is 30 Γ· 150 Γ— 100 = 20%.

How do I add a percentage to a number?+

Multiply by (1 + percentage/100). Adding 18% to β‚Ή1,000 is 1,000 Γ— 1.18 = β‚Ή1,180.

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