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.

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.

If you wish to calculate the GPA or Grade Point Average in Microsoft Excel or other Excel editor, you can use this formula.

Learn how to calculate simple, weighted and exponential moving averages in Microsoft Excel using Data Analysis Tool Pack or Formula.

How to Calculate the Decline in Sales by Percent for the Number of Years in Excel. When calculating a declining sales figure spanning multiple years, you need to calculate two percentages.

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To calculate the average percentage difference over time, you'll need to build a time series of data. The starting point is the price information for each date on which you're producing an average.