Percentage calculator
X% of Y is X × Y ÷ 100. A as a percent of B is A ÷ B × 100. Percent change from A to B is (B − A) ÷ A × 100.
Worked example
- 15% of 200 = 30
- 30 is 15% of 200
- From 80 to 100 is a 25% increase.
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Questions people ask
Is percent change the same as percentage points?
No. Going from 10% to 15% is up 5 percentage points, but it is a 50% increase.
What if the starting value is 0?
Percent change from 0 can’t be worked out, because it means dividing by zero.