Percentage calculator
X% of Y, what percent X is of Y, and percentage change.
Processed on your deviceHow to calculate percentages
- 1
Pick the question you need: X% of Y, X is what % of Y, percentage change, or add/subtract a percentage.
- 2
Type your numbers. The answer updates instantly.
- 3
Use the result in your homework, budget, discount or report.
Frequently asked questions
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
Related tools
Tip calculatorWork out the tip and split the bill between friends.Grade calculatorYour weighted grade, and the score you need on the final.Compound interest calculatorSee how savings grow with regular deposits, with a chart.Age calculatorYour exact age in years, months and days, and your next birthday.