How to use the Percentage Calculator
Choose the calculation type from the tabs — find a percentage of a number, work out what percentage one number is of another, or calculate percentage change. Enter your numbers and the result appears instantly.
Frequently Asked Questions
Multiply the number by the percentage and divide by 100. For example 15% of 200 is 200 × 15 ÷ 100 = 30. Our calculator does this instantly — just enter the percentage and the number.
Subtract the original value from the new value, divide by the original value, then multiply by 100. For example going from 80 to 100 is (100-80) ÷ 80 × 100 = 25% increase.
Divide the part by the whole and multiply by 100. For example 25 out of 200 is 25 ÷ 200 × 100 = 12.5%.
Multiply the original price by the discount percentage and divide by 100 to get the discount amount. Subtract that from the original price to get the sale price. For example 20% off £50 is 50 × 20 ÷ 100 = £10 off, leaving £40.