In short: Percentage Calculator answers what is X% of Y, what percent X is of Y, and the percentage change between two numbers.
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Your files and text are handled entirely on your device using your browser. They are never uploaded to our servers.
Calculations run instantly in your browser. No data is sent anywhere.
How to use Percentage Calculator
3 quick steps. Most people are done in under a minute.
- 1
Pick the calculation type you need.
- 2
Enter your numbers.
- 3
Read the instant result.
Percentage Calculator features
- X% of Y
- X is what percent of Y
- Percentage increase and decrease
- Instant results as you type
When to use Percentage Calculator
- Calculate discounts and sale prices
- Work out exam scores and grades
- Measure growth in revenue, traffic or prices
About this tool
A practical percentage calculator for everyday math — what is X% of Y, what percentage is X of Y, and the percentage change between two values.
Percentage Calculator FAQ
How do I calculate a percentage 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 calculate percentage change?
Subtract the old value from the new value, divide by the old value, then multiply by 100. Going from 80 to 100 is a 25% increase.
How do I find what percent one number is of another?
Divide the part by the whole and multiply by 100. For example, 45 out of 60 is 45 ÷ 60 × 100 = 75%.