Are you sure you need to do this ? Couldnt you just add those as text labels next to the fields ?
Either way, set the field as an auto enter calc, with the do not replace field contents un-checked..
You can then use something like below, each time the value is changed / entered it will append KG and filter out any letters the user enters
GetAsNumber( Self ) & " kg"
I added the GetAsNumber() so if they type in "20kg" they dont end up with "20kg kg"
Thanks... that seems to work except that now when I try to enter something in the field it says "This action cannot be performed because this field is not modifiable." Am I missing something??
Ah... disregard... I figured it out. I was entering the formula you suggested as a Calculation rather than Auto-Enter text. Thanks for the help. :)