How to Multiply a Column of Numbers Times a Percentage in Excel
By C. Taylor
Microsoft Excel 2010 simplifies repetitive calculations, such as multiplying a column of numbers times a specific percentage. For example, multiplying a list of product prices times a specific markup percentage by hand for hundreds of products takes a considerable amount of time, but Excel produces the results almost instantaneously. Although you can use a specific percentage in a formula, it’s more helpful to refer to another cell that contains the percentage. Doing so allows you to easily change the percentage at a later time, if needed.
List your numbers down column A in Excel. As an example, you might list 200 prices from cells A1 to A200. By listing the numbers with a dollar sign in front of them, they are automatically formatted as currency.
Enter "=A1_[percentage]" (without quotes) in cell B1. When substituting "[percentage]" with the actual figure, include the percent sign, so Excel knows it's a percentage. As an example, to multiply by 150 percent, enter "=A1_150%" in cell B1. Alternatively, enter "150%" in cell C1 and refer to that cell by entering "=A1*$C$1" in cell B1. In this case, the dollar signs keep the column and row references from changing when you copy the formula.
Click cell "B1" again, and then press "Ctrl-C" to copy it.
Hold the "Shift" key and click the last cell in column B that corresponds to the last number in column A. In the example, hold the "Shift" key and click cell "B200" to select cells B1 through B200.
Press "Ctrl-V" to copy the formula and multiple all numbers in column A times the percentage.
C. Taylor embarked on a professional writing career in 2009 and frequently writes about technology, science, business, finance, martial arts and the great outdoors. He writes for both online and offline publications, including the Journal of Asian Martial Arts, Samsung, Radio Shack, Motley Fool, Chron, Synonym and more. He received a Master of Science degree in wildlife biology from Clemson University and a Bachelor of Arts in biological sciences at College of Charleston. He also holds minors in statistics, physics and visual arts.