Calorimeters play an important role in experiments operated at present acce
lerators and will continue to do so in the future. The field of calorimetry
is very wide and only a few examples can be reviewed in this paper. As far
as present accelerators are concerned, we will describe the performance of
a few, recently commissioned, precision electro-magnetic (EM) calorimeters
. As an application to future accelerators, we will briefly review the stat
us of calorimetry for the proton-proton experiments at the Large Hadron Col
lider(LHC). (C) 2001 Elsevier Science B.V. All rights reserved.