Fill level measuring device for determining a fill level of a bulk material, comprising: a sensor device for detecting a measured value that corresponds to the fill level of the bulk material at a first point in time; a control unit which is configured for performing the following steps for the detected measured value: Including the measured value into different and mutually independent mathematical models using and calculating a predicted, future fill level at a second, later point in time for each model a Kalman filter, wherein one of the models describes an emptying and another one of the models describes that the fill level does not change; Calculating the quality of each individual model taking into account a difference between the fill level of the bulk material measured by the fill level measuring device at the second, later point in time and the fill levels calculated by the updated models; Weighting and combining the models or selecting one of the models in dependence on their respective quality; Calculating a fill level of the bulk material at the second, later point in time by the weighted and combined models or by the selected model; Output of the fill level calculated by the weighted and combined models or by the selected model. a sensor device for detecting a measured value that corresponds to the fill level of the bulk material at a first point in time; a control unit which is configured for performing the following steps for the detected measured value: Including the measured value into different and mutually independent mathematical models using and calculating a predicted, future fill level at a second, later point in time for each model a Kalman filter, wherein one of the models describes an emptying and another one of the models describes that the fill level does not change; Calculating the quality of each individual model taking into account a difference between the fill level of the bulk material measured by the fill level measuring device at the second, later point in time and the fill levels calculated by the updated models; Weighting and combining the models or selecting one of the models in dependence on their respective quality; Calculating a fill level of the bulk material at the second, later point in time by the weighted and combined models or by the selected model; Output of the fill level calculated by the weighted and combined models or by the selected model. Including the measured value into different and mutually independent mathematical models using and calculating a predicted, future fill level at a second, later point in time for each model a Kalman filter, wherein one of the models describes an emptying and another one of the models describes that the fill level does not change; Calculating the quality of each individual model taking into account a difference between the fill level of the bulk material measured by the fill level measuring device at the second, later point in time and the fill levels calculated by the updated models; Weighting and combining the models or selecting one of the models in dependence on their respective quality; Calculating a fill level of the bulk material at the second, later point in time by the weighted and combined models or by the selected model; Output of the fill level calculated by the weighted and combined models or by the selected model.