A measuring device includes a weighing unit configured to measure a mass value of a urine bag; a control unit configured to calculate at least one of a voided volume and a urinary output per unit time on the basis of the mass value weighed by the weighing unit; a communication unit configured to transmit urinary output information related to at least one of the voided volume and the urinary output per unit time calculated by the control unit; and a first battery configured to supply power to the weighing unit, the control unit, and the communication unit.