Percentage Calculator
Three common percentage questions in one place. Fill in any of the calculators below and the answer updates as you type.
What is X% of Y?
Enter both numbers to see the result.
X is what percentage of Y?
Enter both numbers to see the result.
Percentage increase or decrease
Enter both numbers to see the result.
How to use the percentage calculator
- Pick the question that matches what you need to know.
- Enter the two numbers. Decimals and negative numbers are fine.
- Read the result below the fields. Each calculator works on its own.
Worked examples
Percent of a number
15% of 80 is 12, because 15 ÷ 100 × 80 = 12.
What percentage
30 is 25% of 120, because 30 ÷ 120 × 100 = 25.
Percentage change
A price going from 50 to 65 is a 30% increase: (65 − 50) ÷ 50 × 100 = 30. Going from 80 to 60 is a 25% decrease.
Good to know
- Percentage change is (new − original) ÷ |original| × 100. A change from an original value of zero has no percentage, so it is reported as an error.
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