Select cell C3 click on the lower right corner of cell C3 and drag it down to cell C13. You subtract the second number. Calculating Percentage Decreases in Excel To calculate the percentage decrease between two numbers youll use an identical calculation to the percentage increase.
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As a result a 20 percent increase would be multiplied by 120 percent and a 15 percent increase would be 115 percent or 115. To calculate the percentage increase in Excel which must have at least two values. The percent change formula is used very often in Excel. The values look OK but you want to calculate the percentage increase or decrease between each month.