A process is described for economically evaluating real estates comprising at least one first batch step (Fl) for pre-processing data present on at least one database of real estates for providing pre-processed data adapted to be used in a following step of on-line computing an economic value of at least one certain real estate; and at least one second step adapted to determine and locate homogeneous geographic areas through which it is possible to select at least one sample comprising only real estates comparable with and pertaining to such certain real estate and define value interpolation bands; and a third on-line step (F2) of computing and providing, preferably through a Web Service (WS) to at least one caller application, an evaluation of the mean economic value of at least one of such real estates in a certain geographic zone depending on such pre-processed data. A system is further described for economically evaluating real estates.