How to use Percentage Calculator
- Pick the calculator that matches your question.
- Type your numbers. The answer appears as you type.
- Check the line underneath to see how it was worked out.
About this tool
What is X% of Y? Use this for discounts, tips and tax. For example, 15% of 2,400 is 2,400 × 15 ÷ 100 = 360.
X is what percent of Y? Use this for exam marks or progress towards a goal. For example, 412 out of 550 is 412 ÷ 550 × 100 = 74.9%.
Percentage change from X to Y shows how much something went up or down, such as a price, salary or monthly bill. The formula is (new − old) ÷ old × 100. A negative result means a decrease.
Questions and answers
How do I calculate my exam percentage?
Use "X is what percent of Y": enter marks obtained as X and total marks as Y.
How do I work out a discount price?
Find X% of Y to get the discount amount, then subtract it from the original price.
What is the difference between percent and percentage points?
If a rate goes from 10% to 12%, it rose by 2 percentage points, but by 20 percent relative to its starting value.