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🔢 Math

Percentage Calculator

Calculate percentages instantly — what % is X of Y, percentage change, and more.

%
$
30
Result

About This Percentage Calculator

This percentage calculator handles the three calculations people need most: finding a percentage of a number, working out what one number is as a percentage of another, and calculating a percentage increase or decrease. Enter your figures and the answer updates instantly.

Percentages come up everywhere — discounts and sales, tips, tax, interest, marks and statistics. This tool saves you the mental maths and helps you double-check figures quickly and accurately.

Frequently Asked Questions

How do I find a percentage of a number?+
Multiply the number by the percentage and divide by 100. For example, 20% of 150 is 150 × 20 ÷ 100 = 30.
How do I calculate a percentage increase?+
Subtract the old value from the new value, divide by the old value, then multiply by 100. A rise from 80 to 100 is a 25% increase.
How do I work out what X is as a percentage of Y?+
Divide X by Y and multiply by 100. For example, 30 out of 150 is 30 ÷ 150 × 100 = 20%.

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How to Calculate Percentages: The Three That Cover Almost Everything

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