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To calculate . Subtract the old value from the new value and divide it by the old value. Calculate a Percentage Amount. Like this: Loading. June 21, 2019. First, enter a decimal number. Viewed 13k times 0 I have a calculation which I am unable to crack. Output: Percentage Decrease For percentage decrease, we can use the following formula: = cell_value1 * ( 1- cell_value2) cell_value1: It indicates the cell consisting of original value. C1 is the percentage increase/decrease. 2. Now when working with softwares you are not always guaranteed success, you are bount to encounter some errors.