Four calculations
- What is X% of a number? Number × percent ÷ 100. 15% of 200 is 30. Use it for fees, taxes and tips.
- What percent is one number of another? Part ÷ whole × 100. 30 out of 200 is 15%. Use it for shares, completion rates and vote shares.
- Percentage change (new value − old value) ÷ old value × 100. Going from 80 to 100 is a 25% increase. Use it for price increases, sales growth and returns.
- Increase or decrease by X% Value × (1 ± percent ÷ 100). 50,000 increased by 10% is 55,000; decreased by 10% it is 45,000. Use it for sale prices and prices after an increase.
Percent vs. percentage points
If an interest rate rises from 2% to 3%, it went up by 1 percentage point, but as a rate of change it rose by 50%. News and reports use percentage points for the difference between two rates and percent for how much a rate changed. Enter 2 and 3 in the percentage change calculation and you get a 50% increase.
You can type thousands separators in the inputs. Results are shown to four decimal places (two for percentages).