What is X% of Y?
% of
Enter both values above to see the result.
Types of Percentage Calculations
- Percent of a number — "What is 20% of 150?" → 30
- What percent is X of Y — "30 is what % of 150?" → 20%
- Percentage change — "What is the % change from 80 to 100?" → +25%
Frequently Asked Questions
How do I calculate a percentage?
To find X% of Y: multiply Y by X and divide by 100. Example: 15% of 200 = 200 × 15 / 100 = 30.
How do I calculate percentage increase?
Subtract the original value from the new value, divide by the original, and multiply by 100. Example: from 80 to 100 = (100 − 80) / 80 × 100 = 25% increase.
What is a percentage decrease?
When the new value is less than the original, the percentage change is negative (a decrease). Example: from 100 to 75 = (75 − 100) / 100 × 100 = −25%.