A washing machine and a control method thereof including supplying wash water into a space defined between an outer tub and an inner tub without wetting the laundry placed in the inner tub, operating the circulation pump to supply water from the outer tub to the inner tub, measuring a current value supplied to a circulation pump, stopping the operation of the circulation pump based on the measured current value, and calculating the amount of wash water supplied by the circulation pump based on the number of rotations of the circulation pump integrated until that time.