Percentage Calculator
Calculate percentages and percentage change instantly.
What is X% of Y?
Percentage change
How to use Percentage Calculator
- For a percentage of an amount, enter X and Y in the first calculation.
- For a change, enter the original and new values in the percentage-change calculation.
- Select the matching Calculate button and check which value was used as the base.
Practical example
20% of 250 is 50. Increasing from 80 to 100 is a 25% increase because the difference is divided by the original 80.
What to check before using the result
A percentage change from an original value of zero is undefined. A 20% increase followed by a 20% decrease does not return to the original amount. Use the original-value base consistently, and treat currency results as calculations rather than a financial quote.