A washing machine and a method for controlling a washing machine are provided. The method may include sensing an amount of laundry in an inner tub, configuring an operation setting based on the amount of the laundry sensed, supplying water into the inner tub and obtaining a preliminary water supply time taken for a water level within an outer tub to reach a predetermined preliminary water supply level, spraying the water from the outer tub into the inner tub through a circulation nozzle by driving a pump and obtaining a change of water level within the outer tub as the water is sprayed through the circulation nozzle, adjusting the operation setting based on the preliminary water supply time obtained and the change of water level obtained, and performing a washing operation based on the adjusted operation setting.