I don't know if this complies with the specification, but I'd like the subcaption has the same size as the caption.

So I tried to define like this way:


While the font size of subcaption I got was smaller than caption size.

Strange still, I found that if I changed the option of subcaption from 'font=small' to 'font=normalsize', like this:


Then I got the fontsize of subcaption was 'small'.

I know I've got what I want. But it's so weird, isn't it?

Here is my code for the sub-figure using the package caption and subcaption.


\def\showFontSize{\csname f@size\endcsname pt}


    \subcaptionbox{AAAAA~\showFontSize }{\includegraphics[width=0.48\textwidth]{a.JPG}}%
    \caption{CCCCC~\showFontSize }



And here is the screenshot of my document.

enter image description here

  • 1
    In your example, all the three captions are typeset in 9pt. You can check by adding \showFontSize which is defined to be \def\showFontSize{\csname f@size\endcsname pt} (relying the fact that the current unit-less font size is stored in \f@size). Dec 20 '20 at 3:04
  • Thanks for your code. But i found the problem still exists.
    – go go
    Dec 20 '20 at 3:33
  • I got "9, 9, 9, and 10". What's the version of your LaTeX, and all the included packages? Add \listfiles before \begin{document}, compile, and you can find version info near the end of log file. Dec 20 '20 at 4:20
  • 1
    According to the doc of subcaption, it initially sets font+=smaller. Use \usepackage[font=small,font+=larger]{subcaption} works. Investigating why that behavior changed. Dec 20 '20 at 4:32
  • 2
    I've reported to caption, see gitlab.com/axelsommerfeldt/caption/-/issues/109. Dec 20 '20 at 5:35

According to the reply from Axel Sommerfeldt, author and current maintainer of caption package bundle,

  • the behavior of latest release (CTAN 2020-10-28) is the correct one, and
  • you can either upgrade or use \usepackage[size=small]{subcaption} to achieve the expected behavior (9pt in both subcaption and caption).
  • +1: Thanks for the effort including to contact the package author. Dec 20 '20 at 17:16
  • Thanks for your efforts!
    – go go
    Dec 21 '20 at 0:24

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