Abstract: A method for calculating the geometry of a last for customised footwear includes the following steps: collection in a data base of 3D models of lasts, creation of a grid of lasts having different measurements in terms of length and of fitting, acquisition of a 3D model of a foot, identification of a sub-set of at least two lasts having measurement parameters close to those of the foot, deformation of the 3D model of the foot to follow the course of the 3D last model, identification of some areas of interest of the 3D model of the foot, deformation of the 3D model of each of the lasts selected in the areas of interest so as to compensate for differences between the 3D model of the last and the 3D model of the foot and selection, on the basis of the residual errors, of the final last to be reproduced.