Learn how to calculate Weighted Average in Excel with percentages using the SUM function and the SUMPRODUCT function.

Excel Functions for Adding a Percentage Markup. Microsoft Excel provides numerous mathematical functions that save time and improve accuracy in data entry.

The bigger your spreadsheet, the more you need INDEX and MATCH functions, which you can combine with SUM, AVERAGE, and MAX to refine your searches.

Excel has over 475 formulas in its Functions Library, but we've selected the most popular, from date and time functions to mathematics and simple data manipulation.