What is X% of Y? Percent of a number calculator
Need 15% of a bill, 30% off a price or 5% of a salary? Enter the percentage and the number to get the answer instantly. The formula is simple: number × percent ÷ 100.
Processed on your deviceHow to calculate percentages
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Pick the question you need: X% of Y, X is what % of Y, percentage change, or add/subtract a percentage.
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Type your numbers. The answer updates instantly.
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Use the result in your homework, budget, discount or report.
Frequently asked questions
What is 20% of 150?
30, because 150 × 20 ÷ 100 = 30.
How do I calculate X% 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 work out percentage change?
Subtract the old value from the new one, divide by the old value and multiply by 100. Going from 80 to 100 is (100 − 80) ÷ 80 × 100 = +25%.
Why isn't a 10% rise followed by a 10% fall back to the start?
Because the second percentage applies to a different base. 100 + 10% = 110, and 110 − 10% = 99.
Percentage calculator: popular pages
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