BTW the above tip does work on Adobe cc 2019 with a doc open. Save pref units as millimeters/MM. then re-open prefs and save units as inches. Thanks Jude Wood!

please fix this bug!!! the preferences and/or units in the artboard set up should change the ruler and all units in the document. I want inches -- i work at a publication that uses inches!!!!!

even if i open a doc created in points, when I change the artboard and/OR preferences units to inches, the document should CHANGE!!!! for me the user, not you the coder.

Changing the units in Preferences won't change anything if your document is set up in another unit of measurement. It will work when creating new files but if you're working with a file that was created by someone else or before you switched your preferences, it will revert back to the native document settings. If this happens, open up the file that you want to change the units of measurement in and go to File > Document Setup, change "Units" to your preference, hit "OK" and then save the file before closing. It looks like document setup overrides preferences, which makes sense. Hope this helps everyone.

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Well, a student at Cornish just solved the issue: go to preferences, change to mm, press ok, then change again to inches. And please, fix the bug!

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Did you try changing your prefs with no documents open? That changes the program prefs not an active document pref.

Adobe Illustrator CC refuses to remember General Unit setting on Restarting the program it switches back to Points, even tho i set it to mm under Preferences - Units - General. This was never the case in any itterations of illustrator & should be categorized as an error fix rather than an improvement, i would like to see this changes asap as its rather disruptive

THIS WORKED FOR ME TOO:

I'm having the exact same issue as well since updating to CC2018. I tried two things first that should have worked: (1) changing the units under preferences and (2) right clicking on the ruler and changing it to inches. No luck. Here is what worked, oddly: Start a new document (File>New), in the window that pops up, set the units to inches. Then click create. For some reason that works, it keeps those settings even after closing and reopening.

This centainly needs to happen. I've tried every trick to "fix" this on my Ai but every.single.time I open a new doc on Ai it once again is by default ... as points.

Adobe could for example develop the Preferences so that users could select their own preferences for the various alternatives we have-Web, Print etc. And the easiest way would be if this could be set in the General preferences.

I make a lot of repeat patterns in illustrator used for fabric and wallpaper design so I need to copy a motif in place and then move the duplicated motif across the artboard in exact amounts using inches as my measure so that the pattern repeats seamlessly. Showing me the measurements in points after I have specified inches is a truly horrible bug which makes illustrator unusable for this purpose. There is no excuse for this bug to have been around for so long without being fixed. When will this be fixed so that I don't lose time messing around to trick the software into eventually doing what i need it to?

Deleting prefs solved this issue on a half dozen machines here.

While all of the tips here "work," they do so only temporarily. Here's the behavior I'm observing:

Each time you create a New document, Illustrator saves the dimensions, units, etc. as a template. The next time you create a New document, Illustrator will automatically select the most recently created template and use those dimensions, units, etc. as the defaults.

While the New document page apparently allows one to download additional templates from Adobe.com, I have not found any way to manage the list of templates.

I can see that for some users in some situations, making the new document just like the last one has merit. But at least for me -- and, I suspect, many others -- this is anti-productive. It also seems to come from the "Adobe knows more than you do" design philosophy which is annoying in all its manifestations.

Illustrator should let the user declare defaults: Units, sizes, etc. It could even be useful for the default to be "Same as previous" which would produce the current behavior.

Adobe should also recognize that by NOT allowing the user to control the list of templates in the New file dialog box, they are making the "feature" LESS useful. Suppose I have a handful of commonly used document sizes, but I also do lots of one-offs. If the New dialog showed me my list of common sizes, it would be easy to pick them. Instead, my New dialog box is going to show me all my recent one-offs. By definition, I'm not going to select any of them.

I hope you guys are reading the very valid explanation from Neeraj below. This is clearly a complex problem to solve, since everyone works differently and has different needs ranging from "always the same" to "different for every project" (especially web designers). Seems to me the solution of creating your own master document is a pretty good one — easy and completely customizeable. Or paying attention to the units as you create the document.

The Deleting preferences James mentioned is what worked for me. Tried it on 2 different machines. Found it online tho instead of looking in here. Its always a good idea to do this when you update to a new version of AI.

Same problem here... so irritating

To retain Millimetres as the default application-level Unit, try this:

(1) Quit Illustrator.

(2) Go to <user>/Library/Preferences/Adobe Illustrator 22 Settings/en_US and delete "Adobe Illustrator Prefs" file.

(3) Go to <user>/Library/Preferences/ and delete "com.adobe.Illustrator.plist" file (this is a legacy preferences file from older versions).

(4) Illustrator should then retain any application-level preferences you choose.

Regrettably, this does NOT fix the Units within the New Document dialogue box — all presets/templates keep defaulting to Points, despite Millimetres being the application-level preference. Adobe needs to fix this! :-(

I know this is a bit of an old thread, but how do I change it so that all measurements are in mm. It's all I ever use and I would think that being able to select your own default would be helpful for a lot of people rather than the app constantly changing everything to a measuring system you don't use. It's a waste of my time to have to change it every time when I'm looking for a file size preset.

This should have been fixed from the beginning.
Thankfully someone found a fix.