I have an estimated finish date and an actual finish date with the actual finish date summing up a number of numbers across 6 cells and adding them to a start date to determine the actual finish date.

What I am wondering is instead of using conditional formatting to change the cell colors from green (on time to + 3 days, amber + 4 to 8 days, and red for 9 days +) is there a formula that can be used instead of conditional formatting.