Rob,

A small UDF

Function colwidth(rng As Range)
colwidth = rng.ColumnWidth
End Function

Call with =colwidth(A1) or whichever column you want.

If you want to convert to pixels you can have an approximation by
multiplying * 7.5 or if you'd like to do the maths yourself have a look here
for the correct way to convert. If you drag a column you can see the width in
Pixels in paretthesis.

http://groups.google.com/group/microsoft.public.office.developer.com.add_ins/bro
wse_thread/thread/2fc33557feb72ab4/adaddc50480b8cff?lnk=raot

Me, I'd stick with an approximation!!

Mike

Row heights are measured in points or pixels.  There are 72 points to an inch
and "maybe" 96 pixels to the inch.

The number that appears in the Standard column width box is the average number
of digits 0-9 of the standard font that fit in a cell.

When dragging the column width you will see two numbers.........one is width as
above, the other is pixels.

For an interesting and enlightening discussion on this subject see

http://snipurl.com/dzz8

If you want to use VBA to set height and width in mm.

Ole Erlandson has code for setting row and column dimensions.

http://www.erlandsendata.no/english/index.php?d=envbawssetrowcol

Gord Dibben Excel MVP