How to Change Units in AutoCAD?

AutoCAD units are most time what you should care about before starting any project. The default units is set to inches. If you change the drawing units, you can specify whether existing objects in the drawing are scaled to the new units or retain their original size. You can also specify whether objects inserted from a drawing that uses different units are scaled to the units in the current drawing, or retain their original size.

AutoCAD Units

It is possible to draw in AutoCAD using the following units:

  • Inches
  • Feet
  • US Survey Feet
  • Miles
  • Millimeters
  • Centimeters
  • Meters
  • Kilometers
  • Microinches
  • Mils
  • Yards
  • Angstroms
  • Nanometers
  • Microns
  • Decimeters
  • Dekameters
  • Hectometers
  • Gigameters
  • Astronomical
  • Light years
  • Parsecs
  • Unitless

UNITS (Command) to set default unit

Controls the precision and display formats for coordinates, distances, and angles.

The format, precision, and other settings used to display coordinates, distances, and angles are set through this dialog box, and are saved in the current drawing. It is recommended that you save these settings to your drawing template files to reduce your setup time when you start a new drawing.

The Drawing Units dialog box is displayed.

Enter -units at the Command prompt to display options. And then click on the drop down menu under Insertion scale, select the appropriate unit and click on OK.

Options>User Preferences to control the insert block unit

Insertion Scale

Controls the default scale for inserting blocks and drawings into a drawing.

Source Content Units

If Unspecified-Unitless is selected, the object is not scaled when inserted.

Target Drawing Units

How to Convert Drawing Units from Inches to Centimeters

If you start a drawing in one system of measurement (imperial or metric) and then want to switch to the other system, use SCALE to resize the model geometry by the appropriate conversion factor to obtain correct distances and dimensions.

  1. Click Home tab – Modify panel – Scale. 
  2. At the Select Objects prompt, enter all.
  3. Enter a base point of *0,0.Scaling will be relative to the world coordinate system (WCS) origin and the location of the drawing origin will remain at the WCS origin.
  4. Enter the scale factor. To convert from inches to centimeters enter 2.54 (there are 2.54 centimeters per inch). Or, to convert from centimeters to inches enter 0.3937 (the inverse of 2.54 centimeters per inch).

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