Digits & Decimal Digits

[Anonymous]

Hi Everyone,

I am beginner to the Autocad and wants to learn, How do I change the digits (not the decimal) to enter for the line size, which is attached into screenshot. I am trying to draw the floor plan of the House sizing 23 mtr in length and 16 mtr wide, but the line size number I have to enter is in 5 digits which suppose to be two digits only. For example, 12 mtr long line I want enter just 12.00 rather 12000.00. How do I do that?

[Kent1Cooper]

AutoCAD keeps track of things in drawing units.  The drawing unit can represent anything you choose:

[j.palmeL29YX]

AutoCAD doesn't  work with units (like meter or millimeter or inch or foot), it  works with unitless numbers. The user "thinks" in which unit he want to draw and gives the geometry the unitless dimension values.
If you "think" in meters and want to draw your floor plan, draw a rectangle 23 in length and 16 wide. If you want to draw in the same dwg a nail with diameter or 1 mm, you must draw a circle with a diameter of 0.001. 

In another drawing file you can "think" in millimeters. Then you must draw the for the nail a circle with a diameter of 1, but the floor plan as a rectangle 23000 length and 16000 width. 

Important rule: All geometry in a dwg file must be drawn in the same unit. Which unit you "think" (you should decide at the beginning of drawing)  is your choice and is mostly depending on which industry you work in (architect -> meters, mechanical engineering -> millimeter) and where you life (Europe -> m or mm, America inch or foot). 

If you get a dwg where already a lot of geometry was drawn e.g. in inches (this can only be seen from context) and you want to complete the dwg but further want to think in mm, you should first scale the complete dwg with a scale factor of 25.4 (because one inch = 25.4 mm). 

I hope this answers your question and helps to understand some AutoCAD "internals".