The invention relates to a method for estimating the weight of a motor vehicle including a front wheel assembly and a rear wheel assembly using a smart communication device after loading the vehicle, the method including the steps of: (i) identifying the vehicle in the smart communication device; (ii) using a camera of the smart communication device, capturing and processing a photograph of at least one wheel of the vehicle after loading in order to determine the displacement of the wheel assembly of the photographed wheel on the basis of the identified vehicle; (iii) using at least one accelerometer or inclinometer of the smart communication device, measuring at least one tilt angle of the vehicle after loading in order to determine the displacement of the opposite wheel assembly on the basis of the measured tilt angle, the displacement of the wheel assembly of the photographed wheel, and the identified vehicle; (iv) using a calculation unit of the smart communication device, calculating the load value on the wheel assembly of the photographed wheel and the load value on the opposite wheel assembly on the basis of the respective displacements of said wheel assemblies, in order to determine the total load value of the vehicle; and (v) using the smart communication device, indicating the state of the load of the vehicle to the user.