Percentages aren't always easy to calculate, but one of the best tools in Excel's toolbox is calculating percentages for you. Here's how to do it.

In Excel, there are two ways of calculating the weighted average with percentages: using the SUM function and using the SUMPRODUCT function. Let us have a look at these 2 methods in detail.

How do you calculate percentage increase or decrease in Excel Let us understand the basics of the percentage change. The percentage change is (new value-old value)/old value.

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Instead, you would use the percentage weight when calculating the average. By constructing an Excel spreadsheet, this calculation becomes a simple matter of data entry.

Warnings If you are not careful in collecting and analyzing the numbers you use to calculate ROI, the percentage Excel calculates will provide a false picture of you business's health.