The invention relates to a device, to a vehicle (1), and to a method for measuring a dimension between at least two points on surfaces. The device comprises: at least one image-producing device (4, 7, 10, 12) for scanning the vehicle environment, a display device (8) for displaying the representation of the vehicle environment, an input device (9) for defining at least two points as measurement points, between which the dimensions should be determined, in the displayed representation, at least one environment sensor (7, 10, 12, 13) for sensing the distance and the direction of the measurement points with respect to the vehicle (1), and an evaluating device (3) for determining the dimension on the basis of the sensed distances and directions of the measurement points and for outputting the determined dimension.