I've yet to do it to my truck, but I believe on the right hand side you can choose the unit of measurement.
https://knowledge.autodesk.com/support/3ds-max/learn-explore/caas/CloudHelp/cloudhelp/2015/ENU/3DSMax/files/GUID-22D2D2B9-9A82-47FA-88DD-67B1A91E2337-htm.html This may explain better, as well as the Editor Kingpinn mentioned.
@percymarina hey could you stop making a new topic every day??, I mean read the forum, most of the stuff you've asked are here or in oovee
Not ment to sound or act like a Dick but this starting to look like steam forums were 5 guys aske the same thing the same day