You don't need the SUM function to subtract two cell values SUM(B3-A3) is
the same as B3-A3.

As for you +1 problem, try this...

=IF(AND(A3<"",B3<""),B3-A3,"")

Rick


"chapy354" wrote in message
...
I am trying to set up a formula to count days from start date to end date
including the start day. I have a total of 30 date sets that I need to
track
and total. I have used =SUM(B3-A3)+1 and it accomplishes the task, but it
also adds 1 for every set regardless of the presence of dates in the
cells. I
need it to only add what has been entered. Any help is greatly
appreciated.