Percentage calculator
Three answers in one place: a percent of any amount, what percent one number is of another, and the percentage change between two numbers.
Free tool
What is X% of Y?
X is what percent of Y?
Percentage increase or decrease
Quick tips
- 10% of any amount: move the decimal one place left.
- Marks to percent: your marks ÷ total marks × 100.
- Going up 20% and then down 20% does not bring you back to the start.
How to calculate a percentage
- 1
Pick the question
Percent of an amount, percent of a total, or percent change.
- 2
Enter two numbers
The answer appears as you type.
- 3
Use the result
For marks, discounts, growth, tax or tips.
Questions people ask
How do I calculate a percentage of a number?
Multiply the number by the percent and divide by 100. For example, 18% of 2,500 is 2,500 × 18 ÷ 100 = 450.
How do I turn marks into a percentage?
Divide your marks by the total marks and multiply by 100. For example, 450 out of 600 is 75%.
How is percentage change worked out?
Subtract the old value from the new one, divide by the old value and multiply by 100.
Is it free?
Yes, free with no limit and no signup.
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