# [Tex/LaTex] Chapter header with super huge numbers

sectioningtitlesec

I'm trying to get the chapter heading to look like this

I am using the following code but the number are still so small

\usepackage{titlesec}
\definecolor{gray75}{gray}{0.75}
\newcommand{\hsp}{\hspace{20pt}}
\titleformat{\chapter}[hang]{\flushright\fontsize{80}{110}\bfseries}{\fontseries{bc}\fontsize{100}{130}\textcolor{gray75}\thechapter\hsp}{0pt}{\\\Huge\bfseries}


Can you help??

Is this what you seek?

Your code is basically correct, with some typo though. package fix-cm is required in such case. Since you provided only partial code, I add some basic lines including \selectfont and xcolor to make it run.

\documentclass[12pt, a4paper]{book}
\usepackage{fix-cm}
\usepackage{xcolor}
\usepackage{titlesec}
\definecolor{gray75}{gray}{0.75}
\newcommand{\hsp}{\hspace{0pt}}
\titleformat{\chapter}[hang]{\flushright
\fontseries{b}\fontsize{80}{100}\selectfont}{\fontseries{b}\fontsize{100}{130}\selectfont \textcolor{gray75}\thechapter\hsp}{0pt}{\\ \Huge\bfseries}[]
\begin{document}
\chapter{Chapter name}
some text
\end{document}