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Percentage calculator
Find percentages, percentage changes, and increased or reduced values.
02 / Your result
Your result will appear here.
Start with your own input or try an example.
What it does
Check a percentage without building a spreadsheet. Find a portion of a number, express a part as a percentage of a total, compare an original and new value, or increase and decrease a number by a chosen percentage. The result includes the formula so you can verify which values were used before copying or downloading it.
Useful when
- Calculate how much of an event capacity has been booked.
- Compare a new attendance count with an earlier count.
- Scale a quantity up or down by a known percentage.
How to use it
- Choose the percentage operation that matches your question.
- Enter the two decimal values using the labels for that operation.
- Calculate, review the formula, and copy or download the result.
A few useful details
How is percentage change calculated?
The calculation is (new value − original value) ÷ original value × 100. This mode requires a positive original value to keep increase and decrease unambiguous. A negative result means the new value is lower.
Can I calculate a percentage of zero?
Yes, a percentage of zero is zero. Finding what percentage a part represents requires a non-zero total, and percentage change cannot use a zero original value.
Can percentages be greater than 100?
Yes. For example, 150% of 20 is 30. Increasing 20 by 150% gives 50. Decreasing by more than 100% produces a negative result. Results display up to 12 significant digits.