Work out percentages without the mental gymnastics
Percentages trip people up because the same word covers several different sums: what is 15% of a number, what percentage one number is of another, and how much something changed from before to after. This calculator handles each case separately so you pick the question you actually have and get the answer, rather than second-guessing which formula applies.
How to use it
- Choose the type of question: percent of a value, one number as a percent of another, or percentage change.
- Enter your numbers.
- Read the result.
Everyday uses
- Working out a tip, a discount, or a commission.
- Finding what share one figure is of a total.
- Measuring growth or decline between two values.
Questions people ask
What's the difference between percentage change and percentage points? A move from 10% to 15% is a 5 percentage-point rise, but a 50% increase in relative terms. The calculator shows the relative change.
Is my input stored? No — the maths runs in your browser.