BoneXpert analyses an X-ray of a child's hand automatically, without any interference from a human. The main result is the Greulich Pyle bone age - TW2/3 bone ages can also be given. BoneXpert also reports the bone age standard deviation score. The X-ray can be of a left or a right hand and the hand can assume any rotation in the image plane. The analysis is automatically rejected, if it cannot be done reliably, e.g. if there is too much image postprocessing. Finally, the Bone Heath Index is determined from the cortical thicknesses in the metacarpals.