g-2 of the muon: status report

The anomalous magnetic moment of the muon, g-2, has been measured and calculated with very high precision. It is one of few observables which persistently show a deviation between experiment and Standard Model prediction. In this talk the current status of the theory prediction will be reviewed, with emphasis on the hadronic contributions which are the main source of the theoretical uncertainties. I will also briefly discuss developments of the new g-2 experiments.