  Selected topics of the top-quark mass measurements in well-defined schemes
are presented. The measurements have been performed using data recorded with
the ATLAS and CMS detectors at the LHC at proton-proton centre-of-mass energies
of 7 and 8 TeV. Precision theoretical QCD calculations for both inclusive
top-antitop quark pair production and top-antitop quark pair production with an
additional jet to extract the top quark mass in the pole-mass scheme have been
used.
