Stolen without permission from that website:
In Microsoft Excel, there is no built-in function to calculate the percentage of change from one value to another. However, you can use the following formula to calculate the percentage change:
=(new_value - original_value)/ABS(original_value)
where original_value represents the value that the percentage of change is based on, and new_value represents the value that has changed.
You may also use the following alternate formula:
=(new_value/original_value) - 1
To display the resulting value as a percentage value, format the cell containing the formula with a percentage format.
Click Here Before Posting Data or VBA Code ---> How To Post Data or Code.