Percentage Calculator
Calculate X% of a number, what percent one number is of another, and percentage increase or decrease.
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Percentage of a number
What percent
Percentage change (increase / discount)
How to Calculate Percentages
Three everyday percentage questions, one tool: "What is X% of Y?" — multiply Y by X and divide by 100 (20% of 150 = 150 × 20 ÷ 100 = 30). "X is what percent of Y?" — divide X by Y and multiply by 100 (30 of 150 = 30 ÷ 150 × 100 = 20%). "What is the change from X to Y?" — the difference divided by the starting value ((Y − X) ÷ X × 100), which gives an increase or a discount rate.
All three calculators update as you type, and everything runs in your browser.
Frequently Asked Questions
How do I calculate a percentage discount?
Use the change calculator: enter the old price and the new price. The result is the discount as a percentage — for example from 80 to 60 is (60 − 80) ÷ 80 × 100 = −25%, i.e. a 25% discount.
How do I add a percentage to a number?
Calculate X% of the number with the first calculator, then add it. Example: 200 plus 18% → 18% of 200 is 36, so the result is 236. You can also multiply directly by 1.18.
What is the difference between percentage points and percent?
Going from 40% to 50% is an increase of 10 percentage points, but a 25% relative increase (10 ÷ 40 × 100). Use percentage points when comparing two rates directly.
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Percentage Calculator