You can display "mm" or "m" by formatting the cells that need it with a
custom format. Use something like

0 "mm" in the format

I don't believe that EXCEL will know what the units are when you do your
calculations. You'll need to address that in the calculations directly.

"Prashant" wrote:

I am working on a MS excel sheet that involves lots of calculation ... my
units are mm and m , I have lots of formulae that need to be put with these
units ... can you please help me