  The determination of the charm quark mass is now possible to 1% from QCD,
with lattice QCD pushing the error down below 1%. I will describe the
ingredients of this approach and how it can achieve this accuracy. Results for
quark mass ratios, m_c/m_s and m_b/m_c, can also be determined to 1% from
lattice QCD, allowing accuracy for the heavy quark masses to be leveraged into
the light quark sector. I will discuss the prospects for, and importance of,
improving results in future calculations.
