Percentage calculator
Pick the question you have, then type two numbers. The answer updates as you type.
What you enter stays on this page and is not sent anywhere.
Example: what is 15% of 300?
- 15% of 300
- 45
How to use it
- Choose the kind of question, such as percent of a number or percent change.
- Type the two values. The example question shows which number goes where.
- Read the answer and, for changes, the difference in plain numbers.
Questions
How is percent change worked out?
Percent change is (new value minus old value) divided by the old value, times 100. Going from 200 to 250 is a 25% increase. It cannot be worked out when the old value is 0.
What is the difference between percent and percentage points?
Percentage points are the plain gap between two rates. A rate that goes from 40% to 44% rises by 4 percentage points, which is a 10% increase relative to where it started.
Why does a 20% rise followed by a 20% drop not get me back to the start?
The drop is taken from the bigger number. 100 plus 20% is 120, and 120 minus 20% is 96, not 100.
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