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

Calculate the weighted average of interest rates in Microsoft Excel to compute the most accurate average interest rate among a group of lenders who received different rates.

How to Do Averages With Percentages in Excel. Averages are typically computed as the sum of values divided by the number of data points. However, averages are also calculable from percentages.