We present the results of $W$-boson mass measurements with the ATLAS detector at the LHC based on the 2011 data set recorded at a centre-of-mass energy of $\sqrt{s} =7~\text{TeV}$, and corresponding to $4.6~\text{fb}^{-1}$ of integrated luminosity. The selected data sample consists of $7.8\times 10^6$ $W\rightarrow \mu\nu$ candidates and $5.9\times 10^6$ $W\rightarrow e\nu$ candidates. Measurements are performed through template fits to transverse momentum distributions of charged leptons as well as to transverse mass distributions of the $W$ boson in electron and muon decay modes in various kinematic categories. All the individual measurements are found to be consistent and their combination leads to a value of
$$\begin{eqnarray} \nonumber m_W &=& 80370 \pm 7~\text{MeV} (\textrm{stat.}) \pm 11~\text{MeV} (\textrm{exp.sys.}) \pm 14~\text{MeV} (\textrm{mod.sys.}) \\ \nonumber &=& 80370 \pm 19~\text{MeV}. \end{eqnarray}$$
The measured value of the $W$-boson mass is compatible with the current world average of $m_W = 80385 \pm 15~\text{MeV}$. The uncertainty is competitive with the current most precise measurements performed by the CDF and D0 collaborations.