  The calorimeter system of LHCb is subdivided into four sub-detectors which
ensure its longitudinal segmentation: a Scintillator Pad Detector (SPD)
followed by a Preshower (PS) and then an electromagnetic (ECAL) an hadronic
(HCAL) calorimeter. After a description of these detectors, procedures
developed to calibrate their response are discussed together with the
degradation of response observed due to the harsh conditions (hard radiation
and high current). First results on the calorimeter performance over the two
most productive years of physics data taking, 2011 and 2012 are given.
