Leaving a cell blank in Excel until the data is entered

I need help with an Excel formula. I am trying to create an MPG tracker for my company vehicles, and I would like the results of a formula to remain blank until all the relevant data has been entered. I have my starting mileage in cell B9, my ending mileage in cell C9, and my total miles in cell D9. I would like the total miles cell (D9) to remain blank until I have entered my ending mileage at the end of the day. The current Formula I have entered in cell D9 now is: =C9-B9. See the below screenshot.

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Answer

You can try using IF, OR and ISBLANK like this:

=IF(OR(ISBLANK(B9),ISBLANK(C9)), "", C9-B9)

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