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Decrease by percentage

Excel formula: Decrease by percentage
Generic formula 

To decrease a number by a specific percentage, you can use a formula that multiplies the number by 1 minus the percentage. In the example shown, the formula in cell E5 is:


The results in column E are decimal values with the percentage number format applied.


In this example, the goal is to decrease the prices shown in column C by the percentages shown in column D. For example, given an original price of $70.00, and an decrease of 10% ($7.00), the result should be $63.00. The general formula for this calculation, where "x" is the new price, is:


Converting this to an Excel formula with cell references, the formula in E5 becomes:


As the formula is copied down, the formula returns a new price for each item in the table, based on the percentages shown in column D.

Negative percentages

A negative percentage will have the effect of increasing the original price. For example, with -10% in cell D5 (-0.10), the formula evaluates like this:


This example explains the general formula for increasing a number by a given percentage.

Formatting percentages in Excel

In mathematics, a percentage is a number expressed as a fraction of 100. For example, 95% is read as "Ninety-five percent" and is equivalent to 95/100 or 0.95. Accordingly, the values in column D are decimal values, with the Percentage number format applied.

Dave Bruns

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