Percentage Calculator

Enter a percentage and the number it applies to.

Result
30
Result=percentage100×number\text{Result} = \frac{\text{percentage}}{100} \times \text{number}

How it works

Choose the calculation that matches your question. The answer updates as you type. A percentage change compares the difference with the magnitude of the original value. Increasing by 10% and then decreasing by 10% does not return you to the original amount. Displayed answers are rounded to 12 significant digits.

Example

15%×200=3015\% \times 200 = 30. A change from 80 to 100 is a 25% increase. Reducing 200 by 15% gives 170.

Frequently asked questions

How do I calculate a percentage decrease?

Choose percentage change and enter the original and new values. A smaller new value produces a negative percentage. To reduce an amount by a known percentage, choose increase/decrease and enter a negative rate.

Can I share a calculation?

Yes. Copy link creates a URL containing the calculation mode and numeric inputs. Anyone with that link can restore them.