Multiple IF functions

[mojobaabby]

I need to have the following statement return my square footage two ways...total square footage and total square footage divided by two.
My formula will return correctly if i choose the DH890_1 but it will not give me the half amount if I choose the SL870_1?
Any ideas?

=IF(C7={"DH890_1","SL870_1"},(E7*F7/144)/2,(E7*F7)/144)

[davesexcel]

SL870_1 does not require half the amount only DH890_1 requires half

if E7 = DH890_1 then (E7*F7/144)/2 if it does not then (E7*F7)/144

[mojobaabby]

I need both to return the half amount if chosen as well as some others not yet added to the formula.
Thanks

[davesexcel]

Is an if function required then?

You started with an incomplete question......