There are two types of exponents you can enter in Excel spreadsheets. The most common one is to create an exponent in a calculation, using exponential math on the contents of another cell. Alternately, you can also create text formatting exponents in labels.

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Click on any cell and type an "=" to begin entering a formula. Click on other cells if you wish to automatically add them to the formula as you build it.

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Use caret notation to type exponents in a formula. For example, to insert the cube of the contents of cell A1, type the following:

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\=A1^3

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You can also calculate square and greater roots using exponential fractions. For example, enter the square root of cell A1 as follows:

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\=A1^(1/2)

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Open the Toolbox to enter text formatting for exponents in text labels. Click on the "Toolbox" icon in the toolbar if the Toolbox is not already open. When you reach the exponent you wish to enter, click on the "Formatting" icon to the far left of the top of the toolbar, then click the superscript button. Any text you enter now appears as an exponent. Click the superscript button again to turn this off.