A weighing scale includes a scale body and a detecting board. The scale body includes a platform in contact with feet of a subject, a weighing mechanism, a signal processor, a wireless communication device, and a display screen. The detecting board is separated from the scale body and can abut against a top head of the subject and can move towards or away from the platform. At least one of the scale body and the detecting board includes a signal emitter, and at least one of the scale body and the detecting board includes a signal receiver. The signal emitter and the signal receiver measure a distance between the platform and the detecting board. The signal processor processes data of the signal emitter, the signal receiver, and the weighing mechanism, transmits processed data to the display screen and an external mobile device or server.
