A numerical display device for displaying the size of a person's waist. A belt having a definite length is provided for being positioned about a person's waist. The belt has a buckle attached to one end thereof. The buckle is adapted to secure the belt about the person's waist. A transducer is coupled to the buckle for sensing the length of the belt required to extend around the person's waist and for displaying a numerical figure to indicate the exact length of the belt required to extend around the person's waist, thus indicating the size of the person's waist.