AutoCAD file conversion from inch to mm……………………. – Autodesk: AutoCAD

What exactly are you trying to do? Simple units change so that you 7.3709 inches is now 187.22mm, or just scale by 1/25.4 so that your 7.3709 in is now 7.3709mm?

For the former, I no longer have Autocad so I can’t confirm this but this process seems correct:

1. Type AECDWGSETUP in the command line
2. Click the Units tab in the Drawing Setup dialog box
3. Select the desired units under Drawing Units
4. Set the Precision to the number of decimal places or fractional size
5. Set a different angle type if needed
6. Select a unit to apply automatically to imported content under Insertion scale
7. Click OK