Calculate percentages instantly — X% of a number, percentage change, increase/decrease by %. Free, no signup, works in your browser.
Choose from: X% of Y, what % is X of Y, percentage change, or increase/decrease by %.
Type in the fields — the result updates instantly.
Copy or note the result for your calculations, reports, or everyday math.
Use "X% of Y" mode. Enter 20 as the percentage and 150 as the number — result is 30. Formula: 20 ÷ 100 × 150 = 30.
Use "% Change" mode. Enter 80 as From and 100 as To — the result is 25% increase. Formula: (100 − 80) ÷ 80 × 100 = 25%.
Use "X is what % of Y" mode. Enter 45 as X and 180 as Y — the result is 25%. Formula: 45 ÷ 180 × 100 = 25%.
Use "Decrease by %" mode. Enter the original price as the number and the discount rate as the percentage. For example, $200 decreased by 30% = $140 — your final price after discount.
Use "Increase by %" mode. Enter the pre-tax price as the number and the tax rate as the percentage. Example: $85 increased by 8% = $91.80 (total price including tax).
Use "X is what % of Y" mode. Enter your score as X and total possible points as Y. For example, 42 out of 50: 42 ÷ 50 × 100 = 84%.
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