Subtract final value minus starting value. The ABS function is used in Excel to change the sign of the number to positive or its absolute value. IFA100A11100 in cell B1 where is your percentage increase eg.
Then subtract the starting value from the current value.
Calculating the percentage increase shows how much there has been a change in the value but in terms of percentage increase instead of showing the delta as a Value. As I understand percentages any increase on zero is an infinite percentage increase. If the percentage is negative it means there was a decrease and not an increase. In equation form the overall percentage change is.