How do I calculate X% of Y?

Multiply Y by X and divide by 100. For example, 15% of 200 = (200 × 15) / 100 = 30.

20% of 80 is 16. Calculation: 80 × 20 / 100 = 16.

What is 1% of any number?

1% of any number is simply that number divided by 100. For example, 1% of 350 = 3.50.

How do I add a percentage to a number?

Work out the percentage first, then add it: 20% of 50 is 10, so 50 plus 20% is 60. To take a percentage off instead, subtract it, or use the discount calculator, which shows the saving too.

What is X% of Y?

Enter a percentage and a number to find the result instantly. For example: what is 15% of 200? The answer is 30. The formula is always shown so you can verify the calculation.

Percentage (%)Of number

Enter both numbers to see the result

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How it works

The tool divides the percentage by 100 and multiplies by the number: (15 / 100) × 200 = 30. Results are rounded to 4 decimal places, and the formula line under the result shows the exact numbers used.

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Related operations

For working out fractions of a value, try the fraction calculator. To split a bill including a tip, use the tip calculator. For modelling savings growth over time, see the compound interest calculator.

Frequently asked questions

How do I calculate X% of Y?: Multiply Y by X and divide by 100. For example, 15% of 200 = (200 × 15) / 100 = 30.
What is 20% of 80?: 20% of 80 is 16. Calculation: 80 × 20 / 100 = 16.
What is 1% of any number?: 1% of any number is simply that number divided by 100. For example, 1% of 350 = 3.50.
How do I add a percentage to a number?: Work out the percentage first, then add it: 20% of 50 is 10, so 50 plus 20% is 60. To take a percentage off instead, subtract it, or use the discount calculator, which shows the saving too.

Last reviewed September 30, 2026

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