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I'm writing my master thesis and I would like to change the number of every chapter with one bigger: I tried to use the package "classicthesis" and it does what I want, but I would change the style (font) of the number, because it's horrible for me.

So I would know how can change this font or (it's better) how I can change the chapter number with one bigger than the default in order to use it in every document class (if it's possible).

You can see my code below:


Thanks in advance!

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Could you please add the options you pass to the class and to ClassicThesis? – egreg Mar 23 '13 at 21:01
I added a part of my code. Thanks! – Daniele Mar 23 '13 at 21:11
up vote 6 down vote accepted

The font used for the chapter number is Euler Roman bold at 70pt, because of the eulerchapternumbers option. If you omit it, Palatino would be used.

If you want to use the same typeface as the one used for the chapter title, then you can add to the preamble


Here's a preamble with some changes (I've removed the packages not essential for the example):


\usepackage[T1]{fontenc} % recommended for languages different from English
\usepackage[utf8]{inputenc} % recommended for inputting accented characters


\usepackage{newtxtext,newtxmath} % times is obsolete
\usepackage[scaled=.9]{helvet}   % scaling is recommended


\chapter{Un titolo}

Change the number 70 to what suits you best. However, using Times and Helvetica is really like killing the ClassicThesis project and arsclassica.

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Perfect! Thanks a lot! – Daniele Mar 23 '13 at 21:53

For instance, in order to have a font size of 24pt for the chapter number, with an interlining of 30 pt (~ 20% more than the fontsize), write in your preamble :


To change the font family, you have to use the Karl Berry's names of fonts: to change to Helvetica, say, just use


Compiling with XeTeX or LuaLaTeX makes it much simpler, as you can use the usual names of the fonts (e.g. Helvetica). See the fontspec package documentation for details.

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Welcome to TeX.sx! Redefining \thechapter this way isn't good practice because it will also affect, e.g., cross-references. – lockstep Mar 23 '13 at 21:02
It works well, but the code \renewcommand{\thechapter}{\fontsize{24}{30}\selectfont\arabic{chapter}} changes the fontsize of the sections and subsections, too. I would change only the fontsize of the chapters. – Daniele Mar 23 '13 at 21:12

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