How to work out a percentage
A percentage is just a fraction of 100. To find X% of a number, multiply the number by X and divide by 100. For example, 20% of 250 is (250 × 20) ÷ 100 = 50.
Percentage change
To find the percentage change from one value to another, subtract the old value from the new value, divide by the old value, then multiply by 100. A positive result is an increase; a negative result is a decrease.
Common uses
- Working out a discount or sales tax.
- Comparing a price rise or a pay increase.
- Checking test scores, tips and statistics.