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(window-total-width) returns the number of columns (characters) that fit in the current window (https://www.gnu.org/software/emacs/manual/html_node/elisp/Window-Sizes.html). This will take the current font into account. My header line or mode line might have a different font from the text area (window body). How can I get the number of columns (characters) that fit there instead?

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  • The mode-line fits in a dedicated window ... have you tried measuring that window expressly, e.g., with-selected-window ....?
    – lawlist
    Feb 26 '20 at 21:06
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(/ (window-pixel-width)
   (window-font-width nil face))

will return the current window width for a given face.

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