Percentage Calculator
Three separate percentage questions, each with its own mode: what is X% of Y, X is what percentage of Y, and what is the percentage change from X to Y. Choosing the right mode matters more than the arithmetic — most percentage mistakes come from answering a slightly different question than the one asked.
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Input
Result
20% of 150 is 30
About
What the Percentage Calculator does
The third mode is the one that trips people up. Percentage change is always measured against the starting value, so going from 50 to 75 is a 50% increase, while going back from 75 to 50 is a 33.3% decrease. The same absolute movement gives different percentages depending on direction.
How it works
Using the Percentage Calculator
- 1Pick the calculation that matches your question.
- 2For 'X% of Y', X is the percentage and Y is the total.
- 3For 'X is what percent of Y', X is the part and Y is the whole.
- 4For percentage change, X is the starting value and Y is the ending value.
- 5The answer is shown as a full sentence so you can check the question was read correctly.
Use cases
What people use it for
- Calculating a discount or a tip
- Working out month-on-month growth
- Finding what share one figure represents of a total
- Checking a percentage quoted in a report
FAQ
Frequently asked questions
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