Since you are going to need a calculator to do the maths may as well use the proper numbers. 4mm scale is 1 to 76.2 not 1 to 76. If your real world measurement is in feet just times by 4 and you have the measurement in mm.
I use expo tools scale rulers, Ive got one for each scale ................... Its the easiest method !! you can get them from Expo tools and antics sell them online...
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