\documentclass[border = 3mm]{standalone}
\usepackage{tikz}

\def\width{10cm}
\def\height{10cm}
\thispagestyle{empty}

\begin{document}
\begin{tikzpicture}
  \draw[step=2mm, line width=0.1mm, black!30!white] (0,0) grid (\width,\height);
  \draw[step=1cm, line width=0.2mm, black] (0,0) grid (\width,\height);
  \draw[step=5cm, line width=0.35mm, black] (0,0) grid (\width,\height);
\end{tikzpicture}
\end{document}