  The presently most accurate prediction for the W-boson mass in the Standard
Model is obtained by combining the complete two-loop result with the known
higher-order QCD and electroweak corrections. The numerical impact of the
different contributions is analysed in detail. A simple parametrisation of the
full result is presented, which approximates the full result for M_W to better
than 0.5 MeV for 10 GeV < M_H < 1 TeV if the other parameters are varied within
their combined 2 sigma region around their experimental central values. The
different sources of remaining theoretical uncertainties are investigated.
Their effect on the prediction of M_W is estimated to be about 4 MeV for M_H <
300 GeV.
