Abstract
The LHC is the new CERN hadron accelerator that has recently started to collide proton beams at 7 TeV center of mass energy. It features two general purpose experiments ATLAS and CMS and two specific experiments: LHCb to study b-quark physics and Alice to study heavy ions collisions. Electromagnetic and hadron calorimeters play a crucial role in the ATLAS and CMS experiments. High energy electrons and photons and missing transverse energy are used in most new particle searches. Calorimeters are also used in the experiment trigger.This paper reviews the design of the various electromagnetic and hadronic calorimeters employed in the LHC experiments, their commissioning and the first results on the performance with beam.
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