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How to format fractions

Some people (mostly architectural types) like their fractions like this:

Others (mostly mechanical types) like their fractions like this:

These are called stacked fractions. For Multiline text, you can format fractions as you type, and also set the format of individual fractions if you sometimes need to change the way your fractions look.

To create stacked fractions as you type, open the Multiline Text Editor and follow these steps:

  1. Type the numerator.
  2. Type the character that defines the fraction format you want:
    • Type a slash (/) to create a fraction separated by a horizontal line.
    • Type a pound symbol (#) to create a fraction separated by a diagonal line.
    • Type a carat (^) to create a tolerance stack, which is like a fraction separated by a horizontal line except that there is no horizontal line.
  3. Type the denominator.
  4. Type a space (or other nonnumeric character). The AutoStack Properties dialog box opens.
  5. Change any settings you want to change, and click OK to create the stacked fraction.

You can choose in the AutoStack Properties dialog box how x/y should stack. Then check the Don’t show this dialog again; always use these settings check box so that you can quickly format fractions on the fly.

To individually set the format of a stacked fraction, type the fraction, select it, and right-click. Choose Stack Properties (in some releases, just Properties) from the shortcut menu to open the Stack Properties dialog box.

Here you can choose the style of fraction, specify the position relative to the text baseline, and set the text size for the numerator and denominator. You can use the Defaults button to either restore original defaults or use the settings that you specified in the dialog box as the defaults. Click OK when you’re done.

13 comments to How to format fractions

  • Javid

    Thanks a lot it was very useful information…


    how to write a tolerance with limits like 14 +.02 /-.03

  • Ellen

    Have you tried creating a dimension and using the Tolerances tab of the Dimension Style dialog box?

  • Michel

    Talking about stack fraction….I am wondering how to do stacking in a multiline attribut. I received a block that shows it is possible but cant edit the value, because when i do, i lose the stacking. What is the trick ?

  • Jen

    You can use the coding side in text overrides (#, /, ^).
    eg. in dimension text \S3#5; will produce 3 fifths fraction (\S= stack, ;= end stack)
    or in MText, 3#5 then select that and stack it.
    The symbols I have shown in brackets at the top are Diagonal stack, Horizontal stack and Limits/Tolerance stack.
    NB. you may also find \X and \P useful in text coding :)
    good luck!

  • Ginger

    in Autocad 2013 we checked the do not show this dialogh box for mtext fraction setting. Does not turn back on the way it did from previous versions. How do we get the dialog box back?

  • RickW

    I had the same problem and fought with this for hours. The way I solved it was to use the default “Drawing 1″. I then tried the technique of creating a fraction in mtext, highlighting the fraction and right click. Voila, the Stacked Fraction option appears in the resulting list of options. I set it the way I wanted (non stacked), opened another drawing file and the default had changed to the “Drawing 1″ settings.

  • Keith

    THANK YOU! Very useful information here been struggling with this for a while

  • Michael Quattrone

    Sorry, this is not helpful. I am unable to bring up the stack properities dialogue box

  • janko


    Can anyone tell me, how can I write 1/x^2 in autocad? Beacuse I can make a fraction and write 1/x, but the square of an x I cannot involve in it. So I need a stack in the stack.

    Thanks for an answer!

  • Peter Deniet

    Janko, you can type a superscript 2 by holding down the Alt key and entering in on the numeric keypad the number 0178.

  • Brett

    Thanks Jen for your comments about \S and ;

    Very useful!

  • Andy A

    I need to create fractions, however, within both the numerator and denominator I need both subscripts and superscripts. How can I do this? I have tried things like H^2O/mc^2 but that does not work.
    In Peace,

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