In excel 365 how to subtract values sequentially but skip empty cells

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We have a spreadsheet to keep track of pump runtimes.

snipped screenie

We want the run times in column B to be subtracted, with the result being sent to column C as, for example, B4-B5. 3 to C4. Simple formulas like =B4-B5 in C4 and subsequent columns don't bother me. However, I want B7 to omit B8 and B9 and instead deduct B10 when I arrive to B8. Because it was a weekend on the 25th and 26th, no values were recorded. What, if any, would be a formula I could apply (since these sheets are produced, recorded on the spot, and then sent back to the facility at the end of the month)?

Dec 24, 2022 in Others by Kithuzzz
• 38,010 points
480 views

1 answer to this question.

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Try the following formula in C4 and drag down

=IF(B4<>0,B4-INDEX(B5:$B$33,MATCH(TRUE,B5:$B$33<>0,0)),0)
answered Dec 24, 2022 by narikkadan
• 63,420 points

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