Microsoft Excel spreadsheets support a large number of mathematical formulas to perform operations on data, including a special formula that allows you to instantly calculate the geometric mean. The geometric mean is an average of the set of “N” numbers. This mean is defined as the “N”-th root of the product of numbers (N1 x N2 x …Nn) that comprise the set.

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Open Microsoft Excel. Press “Ctrl-N” to create a new spreadsheet.

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Enter your set of numbers in the column "A" of the spreadsheet. For example, if your set includes four numbers -- 12, 45.5, 89 and 2.4, for example -- enter them in the cells "A1" through "A4."

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Click on the cell “B1." Press the “=” key on the keyboard.

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Type the formula "GEOMEAN(A1:A4”) and press “Enter.”

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Read the geometric mean that is automatically calculated in cell "B1." In this example, the geometric mean of the numbers 12, 45.5, 89 and 2.4 is 18.48.