So my Linear are in Meter. I'm trying to calculating the studs at X mm cts. I've click the cog and change it to measure as mm as per the below. But in the Formula the mm is note getting brought over so its still Linear/600 equalling 0.04 Number . Is setting the mm from the setting just a visual thing and everything need to be treated as Meters

Hi Brendon. Does it work right if you use this formula?
[Linear:mm] / [Stud Spacing]
Note: the "mm" on the variable property is mostly for when it's displayed in legends, reports, etc. then it will show these units. It doesn't impact the formula calculation currently.
Thanks that worked