Learn how to calculate percentages based on criteria in Excel with easy-to-follow formulas, examples, and tips for accurate data analysis. If you want to calculate a p ercentage of a number in Excel , simply multiply the percentage value by the number that you want the percentage of. For example, if you want to calculate 20% of 500, multiply 20% by 500. I.e. type the following formula into any Excel cell: Learn how to use the basic percentage formula and the percentage increase formula in Excel with examples and tips. Also, find out how to format and present percentages in Excel with different decimal positions. Learn how to calculate percentages in Excel using simple formulas. Discover tips for calculating percentage change, weighted averages, and more.