Abstract: The invention relates to a method for automatically monitoring the performance of industrial equipment comprising a compressor. According to the inventive method, operating parameters of said industrial equipment, including at least the gas flow (Q) in the compressor, the pressure (Pin) of the gas entering the compressor, the pressure (Pout) of the gas leaving the compression, the temperature (TrEfr) of the coolant of the compressor, are measured. Automatic calibration subsequently occurs for a calculation rule in order to predict the performance factor and to detect a deterioration of the state of the industrial equipment. The invention can be applied to the production of gas from air.