Percent Calculator
Find percentages, increases, decreases, and percent change.
About the Percent Calculator
Most percentage questions are one of four things: a percentage of a number, an increase, a decrease, or the change between two numbers. This does all four.
How to use it
- Enter the base number.
- Enter the percentage.
- Pick the mode that matches your question.
Worked example
15% of 200 is 30. A 200 increased by 15% is 230. From 200 down to 170 is a 15% decrease.
Common questions
- How do I work out a tip?
- Use 'What is % of number' with your bill as the base and 18 or 20 as the percentage.
- What is percent change?
- The difference between two numbers as a proportion of the first one.
- Why does a 50% fall need a 100% rise to recover?
- Because the rise is measured against the smaller number you are left with.