Hello Monica -
The default in Excel is to do exactly as you want, so if it isn't doing so
(especially if it's the only one) the first thing to be sure of is that the
formula is immediately preceded by an = and that it contains no spaces or
other illegal characters. Otherwise it's simply recognized as a text string.
If the formula is constructed properly & it's still displaying in the cell
it's probably the same situation for all cells containing formulas. To
correct it go to Excel> Preferences> View & clear the checkbox for Show
Formulas. Alternatively you can use Control+` to toggle the display of
formulas/results... Which is quite likely how it accidentally got that way
in the first place
HTH |:>)
Bob Jones
[MVP] Office:Mac