Building calculations in Excel is pretty straightforward. If you want to find the sum of the values in two cells, you just type an equal sign (=), the reference of the first cell, a plus sign (+), and the reference of the second cell. The formula you enter will appear on the formula bar, where you can examine and edit it.
Type the expression representing the calculation you want to perform.
Click the Microsoft Office Excel Help button and then, in the Excel Help dialog box, type common formulas in the Search text field, press Enter, and then click Examples Of Commonly Used Formulas from the list of available topics. The Microsoft Help file that appears has quite a few examples of formulas you might want to create.
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