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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: width of line numbers
Date: Tue, 22 Dec 2020 17:57:15 +0200
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To: Stephen Berman <stephen.berman@gmx.net>
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> From: Stephen Berman <stephen.berman@gmx.net>
> Date: Tue, 22 Dec 2020 11:12:14 +0100
> Cc: gnu-emacs-help@gnu.org
> 
> This should do it:
> 
> (- (window-body-width) (line-number-display-width))

I suggest

  (- (window-body-width) (line-number-display-width 'columns))
                                                    ^^^^^^^^
to make sure you don't subtract apples from oranges...