I am doing a spreadsheet comparing each month's revenue to the month before it. I have no problem setting the formatting if the revenue has increased or decreased. My problem is with the cells where the values haven't been calculated yet. (info coming in the future) Since there is a formula calculating this cell, I think that I have to check for Length = 0. I don't know how to set this up from the "Conditional Formatting" button in Excel 2016. (Please note that I do NOT want to use any VBA macros for this unless absolutely necessary. I would prefer to just use the application's conditional formatting tool.) I have tried using: =Length(B5) = 0 and Length(B5) = 0 but don't get any results. Thanks for the help.