The present invention relates to a household appliance comprising a metering system, which comprises a supply container (101) for a viscous liquid (103) with an outlet (105) for discharging the liquid (103) and a movable closing body (107) for closing the outlet (1, 5), in which the metering system comprises an actuation device (109) for exerting a force on the movable closing body (107), a detection device (111) for detecting a position of the movable closing body over time and a calculation device for calculating the viscosity of the viscous liquid (103) on the basis of the position of the movable closing body (107) over time.