1. A method of calculating the forces (F xw, F yw, F zw ) applied at an interface (Q) between a revolving element ( 1 ) and a support ( 2 ) on which said element revolves about an axis Y, said element being associated with the rotating race of a bearing so as to revolve jointly therewith, said method using a set of fixed sensors capable of delivering three independent signals (S 1, S 2, S 3 ) representative of the forces being applied on the fixed race of the bearing and which result from the forces (F xw, F yw, F zw ), said method comprising: the iterative processing procedure providing the following steps: acquisition of the signals (S 1, S 2, S 3 ); solving of the system (S) S i &equals;(A i ×F xw )&plus;(B i ×F yw )&plus;(C i ×F zw )&plus;k i with i&equals;1 to 3 so as to obtain the values of the forces (F xw, F yw and F zw ) corresponding to each acquisition; and the calibration procedure which is carried out before the first iteration of the processing procedure and which provides the following steps: determination of the constants k i ; application at a given interface (Q 1 ) of successively three given forces (F 1, F 2, F 3 ), so as to determine, by acquisition of the signals (S i ) and solving of the corresponding systems (S), parameters A i, B i and C i.