This percentage calculator has three modes:
- Mode 1: Find what X% of a number Y is (e.g., 20% of 150 = 30).
- Mode 2: Find what percentage X is of Y (e.g., 30 is 20% of 150).
- Mode 3: Calculate percentage change between two numbers (increase or decrease).
Results update automatically as you type. No button clicks needed.
How is percentage change calculated?
Percentage change = ((New - Original) / Original) × 100. Positive means increase, negative means decrease.