answered question 2/5/2010 How Do You Calculate Percentage When One Number Is A Negative Number? If I Want To Show Growth Between 2 Quarters From -$4,000 (negative) To $1,000 (positive); How Do I Show It As A Percentage? For negative or possitive number Growth % formula remain same only difference is when using negative values the percentage growth always come in negative so that to be judged by own sence. Growth = (New figure - Old figure)/ Old figure