An image forming apparatus includes an apparatus body, a recording head, head tanks, a carriage, main tanks, a liquid feeder, a liquid feed controller, a displacement member, a carriage-side sensor, and a body-side sensor. The liquid feed controller controls the carriage-side sensor to detect the displacement member of each head tank during a single scan of the carriage; obtains a current position of the displacement member; determines a liquid amount in each head tank or adjustment operation of the liquid amount based on both a comparison result of the current position and a determination position and a detection result of the carriage-side sensor, the determination position calculated from a detection position of the displacement member detected with the carriage-side sensor and set within a range in which the carriage-side sensor detects the displacement member; controls the feeder in accordance with a determination result; and adjusts the liquid amount.