Set the Units Format
You can specify the display format of the unit. Depending on what you specify, you can enter coordinates in decimal form, fractional form, degrees, or other notation. To enter architectural feet and inches format, indicate feet using the prime symbol ('), for example, 72'3. You don't need to enter quotation marks (") to specify inches.
You can set the unit type and precision in the Quick Setup wizard, the Advanced Setup wizard, or the Units Control dialog box. These settings control how AutoCAD interprets your coordinate, offset, and distance entries, and how it displays coordinates and distances.
You can enter three-dimensional coordinates in the same input formats as two-dimensional coordinates: scientific, decimal, engineering, architectural, or fractional notation.
The units format for creating and listing objects, measuring distances, and displaying coordinate locations is separate from the dimension units setting used in creating dimension values.