I have a worksheet with a "YTD" use table which is fed from information on a
secondary monthly meter reading table. The YTD subtracts the current month's
reading from the prior month's reading.

The problem is once I enter the actual use for one month, say Dec. then Jan
YTD shows that meter reading since there is no data for Jan in the use table
yet. My YTD formula (in essence) says subtract Jan reading from Dec reading
to get an amt used. Is there any way to keep the YTD from displaying the one
month's reading until both month's have been entered to get the actual use?

Use the If function to check for data in the cell first, as in:

=if(b1="","",b1-a1)

--
Regards,
Fred
Please reply to newsgroup, not e-mail


"SLSTAR" wrote in message
...
I have a worksheet with a "YTD" use table which is fed from information on
a
secondary monthly meter reading table. The YTD subtracts the current
month's
reading from the prior month's reading.

The problem is once I enter the actual use for one month, say Dec. then
Jan
YTD shows that meter reading since there is no data for Jan in the use
table
yet. My YTD formula (in essence) says subtract Jan reading from Dec
reading
to get an amt used. Is there any way to keep the YTD from displaying the
one
month's reading until both month's have been entered to get the actual
use?