How it works
X% of Y = X ÷ 100 × Y. X as a percent of Y = X ÷ Y × 100. Percentage change = (new − old) ÷ old × 100.
Frequently asked questions
- What is 15% of 240?
- 36.
- How do I calculate a percentage increase?
- Subtract the old value from the new one, divide by the old value and multiply by 100.
- How do I work out a discount?
- Price × (1 − discount ÷ 100). 20% off $50 is $40.