  We perform a comprehensive analysis of electroweak, QED and mixed
QCD-electroweak corrections underlying the precise measurement of the W-boson
mass M_W at hadron colliders. By applying a template fitting technique, we
detail the impact on M_W of next-to-leading order electroweak and QCD
corrections, multiple photon emission, lepton pair radiation and factorizable
QCD-electroweak contributions. As a by-product, we provide an up-to-date
estimate of the main theoretical uncertainties of perturbative nature. Our
results can serve as a guideline for the assessment of the theoretical
systematics at the Tevatron and LHC and allow a more robust precision
measurement of the W-boson mass at hadron colliders.
