Working with Table Data
You can perform certain calculations on numbers in a Word table using one of Word’s built-in formulas. A formula is a mathematical expression that performs calculations, such as adding or averaging values. To construct a formula, you use the Formula dialog box, which you can access by clicking Formula on the Table menu. A formula consists of an equal sign followed by a function name, such as SUM, followed by the location of the cells on which you want to perform the calculation.
To use a function other than SUM in the Formula dialog box, click the down arrow to the right of the "Paste function" box, and click the function ...
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