Divide the New Value by the Old Value you will get a decimal number Step 2. Although the percentage formula can be written in different forms it is essentially an algebraic equation involving three values. The answer is 125.
Subtract 100 from that.
To calculate the percentage increase. You divide your percentage by 100. Use the Percent Difference Calculator when you are comparing two values and want to find the percentage difference between them. 0125 X 100 125.