You have several choices of how you want measurements to be displayed. This includes both the measurement format (decimal, fractional, etc.) and the precision displayed.
AutoCAD LT does not use a predefined system of unit measure such as meters or inches. For example, a distance of one unit may represent one centimeter, one foot, or one mile in real-world units. Before you begin drawing, decide what distance one unit will represent, and then create your drawing with that convention.
However, 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 in other notation. To enter architectural feet and inches format, indicate feet using the prime symbol ('): for example, 72'3,34'4. You don't need to enter the double prime symbol or 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 LT interprets your coordinate, offset, and distance entries, and how it displays coordinates, distances, and dimensions.
You can enter three-dimensional coordinates in the same input formats as two-dimensional coordinates: scientific, decimal, engineering, architectural, or fractional notation.
If you start a drawing in one system of measurement and then want to switch to the other, you need to scale the drawing by a conversion factor in order to obtain accurate dimensions. For example, to convert inches to centimeters, you scale the drawing by a factor of 2.54. To convert from centimeters to inches, the scale factor is 1/2.54 or about 0.3937.
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.