Is it correct to consider the compressor capacity as the capacity at inlet?

No, it is not entirely correct to consider compressor capacity solely as the capacity at the inlet. Compressor capacity typically refers to the amount of air or gas that can be moved or compressed by the compressor, which is often measured at the outlet under specific conditions, such as pressure and temperature. Inlet conditions can affect performance, but the capacity is more accurately defined by the discharge conditions and the efficiency of the compressor system.