Percentages come up everywhere: discounts, tips, grades, pay rises and statistics. Choose the type of question below and enter your numbers. The working is shown so you can check it, or learn it.
How to use this calculator
- Choose the calculation you need.
- Enter X and Y.
- Read the answer and the working underneath.
How it's calculated
- X% of Y = X ÷ 100 × Y. For example, 20% of 150 = 30.
- X is what % of Y = X ÷ Y × 100. For example, 30 is 20% of 150.
- Percent change = (new − old) ÷ old × 100. From 50 to 65 is a 30% increase.
- X is Y% of what = X ÷ (Y ÷ 100). For example, 30 is 20% of 150.
Common questions
See all: Percentage questions →
Frequently asked questions
How do I calculate a percentage in my head?
Find 10% by moving the decimal point one place left, then scale it. For 15% of 80: 10% is 8, 5% is 4, so 15% is 12.
Is percent change the same as percentage points?
No. Going from 10% to 12% is a 2 percentage point rise, but a 20% increase.
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