Disclosed herein are an air conditioner and a method for controlling the same. The air conditioner includes an indoor temperature measuring unit that measures an indoor air temperature, an outdoor temperature measuring unit that measures an outdoor air temperature, a heat exchanger temperature measuring unit that measures an inlet temperature of one or more indoor heat exchangers and an outlet temperature thereof, and a processor that determines a reference superheat degree using the indoor air temperature and the outdoor air temperature, obtains a difference between the inlet temperature and the outlet temperature of the one or more indoor heat exchangers, compares the difference between the inlet temperature and the outlet temperature of the one or more indoor heat exchangers and the reference superheat degree, and determines whether a circulation amount of a refrigerant is normal according to a result of the comparison.