Abstract: The present invention relates to a scale, a system and a method for determining and/or simulating the proportional dimensions of a selected area of an object or a location, whereupon in a first step a scale with at least two target points having a defined or definable distance from one another is arranged on a selected area of an object or in a location, whereupon in a second step a reproduction is taken of the object or location by a camera, with a scale affixed in the selected area and whereupon in a third step, the reproduction thus taken is read into data processing equipment which is set up in such a way that the proportional dimensions in a selected area are determined or simulated.