By: raymarcher

Here is my cheat cheat for units in 3ds max:

units

general:
-always set up the system unit before you import or create geometry
-do not change system units in an existing scene
-system units: 1 inch, leave as standard for compatability reasons
-1 unit is 1 cm
-display units: cm, important for fbx

system units:
-determines the actual scale of geometry
-1 unit is size for smallest geometric detail of scene

system unit calculator:
-use the slider to enter the distance from the origin to see the resulting acuracy at that point

display units:
-affects how geometry is displayed in viewports
-use whatever display unit, has no impact on scene

file load units mismatch:
-appears when opened file has different system unit settings than the current session
-option 1: rescales to match current sytem unit settings
-option 2: adopt, changes current system unit settings to settings opened file

Source: http://blog.turbosquid.com/2010/11/23/3d-modeling-real-world-scale/comment-page-1/#comment-10676

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