Math guide
Percentage Calculator: Formula and Common Examples
A percentage calculator helps you find a percent of a number, compare changes, calculate discounts, and solve daily math quickly.
Basic formula
Percentage value = number × percentage ÷ 100. For example, 15% of 200 is 30.
Useful related tools
Use the discount calculator for sale prices, tax calculator for final totals, and percentage change calculator on the Extra Tools page.
FAQ
How do I calculate discount percentage?
Multiply the original price by the discount percentage, then subtract the discount amount from the original price.