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I need to add up a column of number returned using vlookup. When I use Sum, it returns a blank if the vlookup returns #N/A, as the cell has no value. Can I then get this to show a zero instread of #N/A so the above sum works ?

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up vote 0 down vote accepted

You can use a conditional:

=IF(ISERROR(<cell>),0,SUM(<...>))
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Try wrapping your VLOOKUP formula in IFERROR function, e.g.

=IFERROR(VLOOKUP(A1,B1:C10,2,FALSE),0)

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