Three percentage calculations in one
Percentages come up everywhere — tips, discounts, grades, taxes, and data. This calculator handles the three most common questions:
- What is X% of Y? — e.g. 15% of 200 = 30.
- X is what percent of Y? — e.g. 30 is 15% of 200.
- Percentage change — the increase or decrease from one number to another.
The formulas
- Percent of a number: (percent ÷ 100) × number.
- Percent one number is of another: (part ÷ whole) × 100.
- Percentage change: ((new − old) ÷ old) × 100 — a negative result means a decrease.