A shoe-measuring gadget for determining the accuracy of fit of shoes has a foot length-measuring device for determining the foot length of a foot positioned in the shoe-measuring gadget and an inner shoe length-measuring device for determining the spatial length remaining between the longest toe of the foot and the inner shoe wall opposite this toe. The gadget can be used for determining the accuracy of fit after the foot measurement determination in the shoe. The shoe-measuring gadget has a width-measuring device designed in such a way that it is capable of recording the foot width of the foot positioned in the shoe-measuring gadget and, the inner shoe width in the shoe-measuring gadget inserted in the shoe.