# Changing font size for chapter title and number

I want to change the font size for the chapter title and chapter number.

My code in part is as below.

I want the font for the chapter to be greater than the one achieved through \Huge. Is there any way to do that for the document class I am using?

\documentclass[a4paper,12pt,oneside]{report}
\usepackage[left=3.81cm,right=2.54cm,top=2.54cm,bottom=2.54cm]{geometry}

\usepackage{sectsty}

\chapternumberfont{\Huge}
\newcommand{\chapfnt}{\fontsize{300}{250}}
\newcommand{\secfnt}{\fontsize{14}{17}}
\newcommand{\ssecfnt}{\fontsize{12}{14}}
\chaptertitlefont{\Huge}


My current font size looks like this:

\fontsize{<size>}{<baseline skip>} should be followed by \selectfont in order to select the font:

\documentclass{report}

\usepackage{sectsty,lmodern}

\begin{document}

\chapter{A chapter}

Lorem ipsum \ldots

\chapternumberfont{\fontsize{35pt}{32pt}\selectfont}
\chaptertitlefont{\fontsize{38pt}{35pt}\selectfont}

\chapter{A chapter}

Lorem ipsum \ldots

\end{document}