If we want to find the geometric mean of an array of numbers, we can use the **Excel GEOMEAN function**. Note that this function can only work with positive. This article provides a clear guide with illustrative examples on how to use the Excel GEOMEAN function to calculate the geometric mean of numbers.

*Figure 1: Using GEOMEAN function*

**Syntax of the formula**

**=GEOMEAN (number1, [number2]….)**

Where;

**Number1-**refers to the first value or reference**Number2-**refers to the second value or reference, it is optional.

**Explanation**

GEOMEAN function in excel calculates the average rate of return of a set of values which is calculated using the products of the terms. In our example above, we have used the GEOMEAN function to calculate the monthly growth rate. This has been made possible by the use of the growth factor in column C, then we subtract 1.

The formula in cell F4 of our formula is;

**=GEOMEAN(C2:C8)-1**

**Things to remember**

It is important to remember that arguments can be numbers, names, arrays or cell references which contain numbers.

Also, empty cells or cells that contain text or logical values are ignored by the GOMEAN function.

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