Excel already has this feature.

A1 has 4
B1 has 5
C1 has =A1*B1 which returns 20

Custom Format to 0"ft" and Alt + 0178


Gord Dibben MS Excel MVP

On 30 Apr 2007 15:28:51 -0700, wrote:

It just occured to me that a really nice feature of Excel would be to
keep track of units if you wanted it to. It is part way there with
the CONVERT() function, but what I would envision would be to be able
formate a cell as a special kind of number that has units associated
with it. So when you take 2 cells with ft as units that it knows the
the resulting value has units of feet squared.