Do you know that there is a converter of measurement units available in AutoCAD? You can use the LISP function "(cvunit)" and the unit definition file ACAD.UNT to convert between different length-, area-, volume-, mass-, time-, angular-, and temperature units.
Examples:(cvunit 1 "minute" "second") ... 60(cvunit 1 "are" "hectare") ... 0.01(cvunit 1 "fathom" "meter") ... 1.8288(cvunit 1 "foot" "meter") ... 0.3048
Of yourse you can use a real converted value instead of "1". This value (specified in the first units) will be converted to the second physical measurement units.
You can see all predefined measurement units in the file ACAD.UNT in the AutoCAD Support folders.
Alternatively, you can use our online interactive unit converter, or the free ConvertUnits add-on palette - available also on Autodesk Apps.