Abstract: The invention refers to a shoe-measuring gadget (1) for determining the accuracy of fit of shoes (22), which has a foot length-measuring device (2) for determining the foot length of a foot (21) positioned in the shoe-measuring gadget and an inner shoe length-measuring device (3) for determining the spatial length remaining between the longest toe of the foot (21) and the inner shoe wall opposite this toe. The shoe-measuring gadget can be used for determining the accuracy of fit after the foot measurement determination in the shoe (22) intended for this purpose. According to the invention, the shoe-measuring gadget has a width-measuring device (14) designed in such a way that it is capable of, at least area-wise, recording the foot width of the foot (21) positioned in the shoe-measuring gadget and, at least area-wise, the inner shoe width in the shoe-measuring gadget inserted in the shoe (22).