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How to change units in AutoCAD drawing

Last Updated: January 30th, 2022By Categories: AutoCAD

In this article, I will explain two basic methods by which you can change units in AutoCAD drawing. I have also made this video to explain this tip in detail, In case you don’t prefer the video scroll below for the article.

Let’s assume that you have a drawing which is in imperial units (inches) and you want to convert it into metric units (mm), let’s name that drawing Sample.DWG.

Using -DWGUNITS command:

This is an easy method of converting the unit of drawing but it will work only for AutoCAD 2009 and later versions.

Open Sample.DWG drawing (imperial) in AutoCAD and then type -DWGUNITS on the command line (don’t forget to add the dash before command) and press enter. Now, look at the command line prompt which looks like the image shown below.

How to change units in AutoCAD

Here you need to specify unit which you want to use in the current drawing, type the order number of unit and that unit will be applied. In this case, the millimeter option is in third place and hence typing 3 and pressing enter will select millimeter as drawing unit. Similarly, from other prompts use options as shown below.

Linear display format    <2>

Linear display precision   <4>

Scale objects from other drawings upon insert?    <yes>

Match INSUNITS to drawing units?    <yes>

Depending on your selection you may or may not see following prompts on the command line. Select yes from both of these prompts.

Scale objects in current drawing to reflect change in units? <yes>

Include objects in Paper Space? <yes>

Your drawing is now converted to metric with millimeter as drawing unit. You can verify the result by measuring the distance between any two points in the drawing, it will now be reported in millimeter instead of inches.

Changing by block import:

This method of converting unit is destructive in nature and you will lose a lot of data from your drawing, mostly named objects like layers, blocks, and linetypes.

Open a new session of AutoCAD and click on New Drawing from the application menu, a template selection window will appear select acadiso.dwt template from this window and click open.

how to convert mm to feet in autocad

Now type UN on the command line and press enter Units window will appear. Select millimeters from Insertion Scale drop-down menu, you can select any other unit as well as per your own need but for this article, I will stick with millimeters.

Now type I on the command line and press enter, browse your imperial unit drawing Sample.DWG from insert window.

Uncheck Specify On-screen radio button from insertion point, Scale and Rotation panels, also make sure explode radio button is checked in the lower left corner of the Insert window.

Convert units of drawing in AutoCAD

If you have followed all these steps correctly then you will see a conversion factor of 25.4 in block unit panel now click OK to close the Insert window.

Your drawing with converted units will be inserted into the new template and now if you check distances in drawing it will be reported in millimeter instead of original inches.

Did you find this tip useful and which method you prefer to convert your drawings from one unit to other? Let me know in comments below.

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49 Comments

  1. MUHAMMAD RIAZ March 16, 2022 at 12:26 pm - Reply

    SIR IF I WANT TO CHANGE MM INTO METER ,SO TELL ME ABOUT THAT WAHT A METHOD.

  2. Prabodha Das July 29, 2021 at 7:44 am - Reply

    I have a dwg file in 1:1 scale, how i print in A4 paper that dwg in scale 16″=1 mile
    Plz help me

  3. Pranali Dalvi December 31, 2020 at 1:23 pm - Reply

    Thank you alotttt!!!!!!
    It helped me alotttt!!!

  4. Md Mustafizur Rahman July 29, 2020 at 10:59 am - Reply

    Dear Jaiprakash Pandey,

    I am good in AUTOCAD 2d. I want to be expert in AUTOCAD 3D and INVENTOR as an Electrical Engineer.
    How can I be expert as a certified AUTOCAD Designer

    • Hamsa August 1, 2020 at 11:16 pm - Reply

      Sir I need to learn 2d autocad if u don’t mind plss help me out

  5. Kumar July 27, 2020 at 5:17 am - Reply

    Very good article. So should we stick to first method (through command line) and not the second method (block import) since second method is destructive in nature ?
    Regards,

  6. John Modlin July 18, 2020 at 5:29 am - Reply

    Sir:
    I am just an over educated Country bumpkin, but you explain things in a way that makes since to me. Thank you for your work, it is appreciated.

    • John July 18, 2020 at 5:32 am - Reply

      I know how to spell “sense”. I did not notice that the computer had changed my spelling. Dang, I hate autofill!

  7. Taliniu.Teeve July 9, 2020 at 3:22 am - Reply

    Thanks very much for these tutorials that you have prepared. I learnt a lot from these. Thanks again.

  8. Pedro Fula May 26, 2020 at 11:11 pm - Reply

    Your teaching method is really improving my skills. Thanks

  9. ray waesa May 15, 2020 at 4:39 am - Reply

    thanks mate wow

  10. Waseem Khanum M May 4, 2020 at 1:28 am - Reply

    Very informative video, thanks jai….

  11. PREM UMARWAL April 25, 2020 at 4:19 pm - Reply

    Thanks you for this command

  12. Sushant April 24, 2020 at 4:23 pm - Reply

    Very Helpful tips.
    I tried to down load e books. I did not receive any.

  13. Vishwajeet April 22, 2020 at 11:34 pm - Reply

    Very nice and thanks

  14. Ryan April 22, 2020 at 12:49 am - Reply

    Make your old drawing a block then insert it in the required unit environment Or use paper space to manipulate the drawing scaling hint units command before scaling. This requires math so good luck.
    1 inch = 2.54 mm. So that in mind, run the numbers to correct…. method by dimstyle command…. sometimes it’s necessary to go into the current dim style and change units to dual (imperial and metric). It always depends on your situation so if you have a picture and show what you have it’s easier to say what is easiest to do.

    • Paul MT May 2, 2020 at 1:49 am - Reply

      The conversion factor should be 25.4 to convert inches to millimeters NOT 2.54 that converts to centimeters.

    • mic July 14, 2021 at 1:51 pm - Reply

      1 inch =2.54 cm

  15. Cosam Chibela April 15, 2020 at 9:26 pm - Reply

    The notes are simple and straight to the point.
    Thanks

  16. razack April 10, 2020 at 7:08 am - Reply

    I have finished a project, but it, I had the wrong units, can I still change it withot sale?
    (i made 100 x 50 inch but i want 100 x 50mm)

  17. Said Mohamed March 30, 2020 at 11:41 pm - Reply

    I have learnt a helpfull skills of converting one unit into another. Thsnks my teacher.

  18. Manikanchan Dutta January 5, 2020 at 4:42 pm - Reply

    My requirements is to make scan image from paper map …. which is 32″ = 1 Mile.

    1 = 7.92″ & 1 Gunter Chain having 66′ or 100 link.

    So, please help me to scale AutoCAD map settinng.

    1.What will be the scale …. Is it in feet or inches ?
    2.What will be the scale factor ?

  19. Manikanchan Dutta January 5, 2020 at 4:40 pm - Reply

    I am totally new , but my requirements is to make scan image from map which is 32″ = 1 Mile.
    When, 1 Link comes to 7.92″ & 1 Gunter Chain having 66′ or 100 link.

    So, please help me to scale AutoCAD map setting in 32″ =1″.

    1.What will be the scale …. Is it in feet or inches ?
    2.What will be the scale factor ?

  20. Vince November 20, 2019 at 1:25 pm - Reply

    I have finished a project, but it turned out, I had the wrong units, can I still change it?

  21. ahmed ally November 28, 2018 at 3:55 pm - Reply

    I change AutoCAD inch scale mode to meter but it display an error. What can I do?

    • Umesh Tripathi April 22, 2020 at 5:56 pm - Reply

      Nice information
      This is helpful for me
      Thank you sir for this

  22. Ivan August 30, 2018 at 5:19 am - Reply

    Hi i am site surveyor and i was looking for smtn that can help in transforming new coordinates to dwg etc with civil 3d 2017.. Thanks for upcoming notes

  23. VARUN August 28, 2018 at 5:25 pm - Reply

    Sir my drawing is in meters, I have to convert this drawing to scale of 16inches is equal to 1 mile.
    Can you please guide me steps which I have to follow to convert my drawing to a scale of 16inches is equal to 1 mile.

  24. anagh June 11, 2018 at 5:28 pm - Reply

    can u give me ur whatsapp no.sir?

  25. R.THIYAGARAJAN May 3, 2018 at 4:38 pm - Reply

    I am a civil engineer, though I went for AutoCAD civil course still i have doubts on setting my work space and in choosing easy method of inputs and setting up of panels such as o snap etc.
    Can anyone guide me ?

  26. Olaniyan Umar March 7, 2018 at 7:22 pm - Reply

    I need an illustration, maybe a video on showing me how scale and units are plotted in AutoCAD 2010 … Like how it look like when plotting in the scale 1:100 in millimeter, and u are making a line 3000m.
    Please sir

    • Jaiprakash Pandey March 10, 2018 at 5:48 pm - Reply

      Here is a two-part video series that will help you in understanding scale related tools. https://www.youtube.com/watch?v=8D_WtxCr70I

      • M-Azeem December 12, 2018 at 8:06 pm - Reply

        HI SR i’m Azeem and i have question sr when i use x ref command in auto-cad i have one dwg in mm and one dwg in inch so when i use x-ref command then one object is to small and one object is to large to show on my display so can you help me sr .

    • Peter2 April 23, 2018 at 7:38 pm - Reply

      IMHO it is important not to mix up “scaling between drawing units” and “scaling to get a plot” – sounds to be the same, but it is very different.

      • Jaiprakash Pandey May 5, 2018 at 12:15 am - Reply

        Certainly peter, it should be avoided as far as possible but if for any reason they end up messing up scales and units then they can bring things in order using these tips.

        • MUHAMMAD RIAZ March 16, 2022 at 12:54 pm - Reply

          hi sir if i want to change mm into meters ,so tell me about that.

  27. Fayas October 1, 2017 at 10:41 am - Reply

    Thank You Mr.Jaiprakash Pandey..

  28. Shiva Adhikari September 27, 2017 at 8:51 am - Reply

    Thanks lot for your tutorial. what is the function of Scale objects from other drawings upon insert? [Yes/No] :
    Match INSUNITS to drawing units? [Yes/No] :

  29. JOSEPH March 10, 2017 at 4:56 pm - Reply

    I HAVE A PROBLEM PLOTTING MY DRAWING. I NEED MY ONE DRAWING UNIT TO BE PLOTTED AS 10 MM ON PAPER SO I PLOTTED BY GIVING 10:1 (MM:DU) THE DRAWING DOES NOT GETS PLOTTED IN THE ACTUAL SIZE I WANT… I MADE THE DRAWING IN AUTOCAD 2007 AND TRIED PLOTTING IN 2010 & 2014 VERSIONS BOTH RESULTS ARE SAME… ANY SUGGESTIONS ???

  30. Jonas December 14, 2016 at 1:58 pm - Reply

    Great tutorial, thanks

    • Jaiprakash Pandey December 14, 2016 at 2:09 pm - Reply

      Welcome Jonas

  31. Ashfaque N. Ansari October 9, 2016 at 12:04 am - Reply

    i selected option 4.
    after converting from mm to inch, the dimension is in inch but, the dimension style is in decimal.
    why is it not in architecture

    • Jaiprakash Pandey October 15, 2016 at 8:24 pm - Reply

      You need to modify dimension style to show architectural units, from primary units tab change unit format to architectural.

  32. N.Saravanan April 26, 2016 at 8:22 pm - Reply

    ‘DWGUNITS’ really useful, but why to enter (4) for precision? all the best!

    • Jaiprakash Pandey April 26, 2016 at 10:54 pm - Reply

      when you use enquiry commands to find length and other measurements in the drawing then it will be shown with accuracy up to four decimal places. For example setting precision to 4 will display a distance as 12.2345 if you change it to 2 then it will show same distance as 12.23

  33. Anonymous April 21, 2016 at 1:48 pm - Reply

    still am confused

    • Jaiprakash Pandey April 21, 2016 at 11:00 pm - Reply

      How can I help you with this tip?

  34. Ernst Lindor March 16, 2016 at 6:00 am - Reply

    I HAVE FOLLOWED THE DIFFERENT STEPS AND MY DRAWING LOOKS SCRAMBLED.

    • Bashir Danjuma April 28, 2020 at 9:41 pm - Reply

      ?

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