  The top-quark mass mt is one of the fundamental parameters of the standard
model (SM) of particle physics. The CDF and D0 collaborations already performed
very precise measurements of mt . Since the ATLAS and CMS collaborations
already have a very large sample of top quark pairs available for analysis,
they are producing results with increasing precision. An overview of the most
recent measurements of mt by ATLAS and CMS is given, using up to 4.7 fb-1 of
data in different ttbar decay channels. The measurement of the mass difference
between top and antitop quarks is also shown. Finally, the combination of the
individually measured mt values is discussed, together with an outlook for
future mt measurements.
