If it helps, the analysis tookpak has a convert function
=+CONVERT(1,"in","m")
returns 0.0254
Let's say you had 3 columns
A-OldUnit B-OldValue C-NewUnit D-NewValue
You could calculate column D using formula like
D2 =+CONVERT(B2,A2,C2)
To put the results into the same location will require some sort of macro.
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