How to use the Percentage Calculator
- Pick the calculation you need.
- Type the two numbers.
- The answer appears instantly.
About this tool
Percentages are everywhere — discounts, tips, grades, pay raises, interest rates and statistics. This calculator handles the four most common questions without having to remember any formulas.
- X% of Y = X ÷ 100 × Y
- X is what % of Y = X ÷ Y × 100
- % change = (new − old) ÷ old × 100
- Discount price = price × (1 − discount ÷ 100)
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. 20% of 50 = 10.
How do I calculate percent increase?
Subtract the old value from the new value, divide by the old value and multiply by 100.
What’s the difference between percent and percentage points?
Going from 10% to 12% is a 2 percentage-point rise, but a 20% relative increase.