How do I find X% of a number?

Multiply the number by the percentage divided by 100. For example, 15% of 200 is 200 × 15/100 = 30. The first box does this for you.

How do I find what percent one number is of another?

Divide the first number by the second and multiply by 100. For example, 30 out of 200 is 30/200 × 100 = 15%.

How is percentage increase or decrease calculated?

Subtract the old value from the new value, divide by the old value, and multiply by 100. Going from 200 to 250 is a 25% increase.

Percentage Calculator

Three common percentage calculations in one place.

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What is X% of a number?

Percent

% of

Value

= 30

X is what percent of Y?

= 15%

Percentage increase / decrease

From

= +25%

Everyday percentage maths

Whether you're working out a discount, a tip, a test score or a price change, this tool handles the three most common percentage questions: what is X% of a number, X is what percent of Y, and the percentage change between two values. Results update as you type.

Common uses

Discounts and sale prices.
Marks and exam score percentages.
Price rises and salary hikes.
Tips, commissions and interest.

Frequently asked questions

How do I find X% of a number?: Multiply the number by the percentage divided by 100. For example, 15% of 200 is 200 × 15/100 = 30. The first box does this for you.
How do I find what percent one number is of another?: Divide the first number by the second and multiply by 100. For example, 30 out of 200 is 30/200 × 100 = 15%.
How is percentage increase or decrease calculated?: Subtract the old value from the new value, divide by the old value, and multiply by 100. Going from 200 to 250 is a 25% increase.

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