The method is used to determine the filling level of a loaded mill container (2). The container (2) has a drive torque (M) applied to it by means of a drive (6), and causes it to rotate. The drive torque (M) on the drive (6) is set by means of a predeterminable drive test sequence. A time/rotation speed profile of a rotation speed of the container (2) which results from the drive test sequence is recorded, and is analyzed. The filling level is determined on the basis of the results of the analysis. The method produces up to date, accurate information, determined during the milling operation, about the filling level of the container (2).