How do I calculate a percentage of a number?

Multiply the number by the percent and divide by 100. Example: 20% of 50 = 10.

How do I calculate a discount?

Use percentage change from original to sale price, or apply the discount rate to the original price.

Divide the tax-inclusive price by (1 + rate). With 21% VAT: price ÷ 1.21.

Tool guide

Practical information to understand the result and use this tool correctly.

A percentage is a part per hundred. “15% of 240” means 240 × 15 ÷ 100 = 36.

Common cases: percentage of an amount, ratio as a percent, and percentage change between two values (including discounts).

All results update in the browser; enter decimals as needed.

How do I calculate a percentage of a number?: Multiply the number by the percent and divide by 100. Example: 20% of 50 = 10.
How do I calculate a discount?: Use percentage change from original to sale price, or apply the discount rate to the original price.
How do I remove tax from a price?: Divide the tax-inclusive price by (1 + rate). With 21% VAT: price ÷ 1.21.