Percentage Calculator

1. What is X% of Y?

To find what is X% of Y, multiply Y by X/100.

Example: What is 20% of 150? → 150 × (20/100) = 30

2. X is what percent of Y?

To find what percent X is of Y, divide X by Y and multiply by 100.

Example: 30 is what percent of 150? → (30/150) × 100 = 20%

3. X is Y% of what number?

To find the number that X is Y% of, divide X by (Y/100).

Example: 30 is 20% of what? → 30 ÷ (20/100) = 150

4. Percentage Increase/Decrease

To find the percentage increase or decrease from old value to new value:

((New - Old) / Old) × 100%

Example: Increase from 100 to 120 → ((120-100)/100) × 100% = 20% increase