Measurements of the top-quark mass and properties at CMS

Measurements of of the top-quark mass and other top-quark properties are presented, obtained from the CMS data collected in 2011 and 2012 at centre-of-mass energies of 7 and 8 TeV. The mass of the top quark is measured using several methods and decay channels. The measurements of the top-quark properties include the W helicity in top-quark decays, the search for anomalous couplings, the ratio of bW/qW using both tt and single-top quark event samples. The results are compared with predictions from the standard model as well as new physics models. The cross section of tt events produced in association with a W, Z boson or a photon is also measured.