Percentage increase and decrease are calculated by computing the difference between two values and comparing that difference to the initial value. Were still working with ordinary numbers at this point not percentages. The percentage increase calculator is a useful tool if you need to calculate the increase from one value to another in terms of a percentage of the original amount.
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To format the result as a percentage click the Percent Style button in the Number section on the Home tab. Subtract starting value minus final value Divide that amount by the absolute value of the starting value Multiply by 100 to get percent decrease If the percentage is negative it means there was an increase and not an decrease. 105 35 03 Finally to get the percentage we multiply the answer by 100. If the total you get from this method is negative then it is a percent decrease rather than a percent increase.