How to Calculate the Percentage Change in Two Numbers in Excel

1. Find the beginning number and the ending number. For example, assume a business has income of $700 in 2009 and $1,300 in 2010.
2. Type the beginning number in cell A1 of your Microsoft Excel page. In the example, type '700' in cell A1.
3. Type the ending number in cell A2. In the example, type '1,300' in cell A2.
4. Type '=((A2-A1)/A1)' in cell A3. This calculates the percent change. In the example, your results should be 0.857. You can convert this to a percentage by formatting the number as a percentage using the tool bar.