The method involves determining an expected current actual wear of a roller by a wear model using actual parameters of flat rolled goods and/or a roll stand based on an initial state of the roller (S1). An expected future actual wear of the roller is determined (S2) by the model using expected actual future parameters of the goods to be rolled in future at a position of future roller run based on the expected current actual wear. The position, the expected future actual wear and/or information derived from the parameters are provided (S3) to an operator of a roller mill. Independent claims are also included for the following: (1) a computer program comprising a machine code for executing a method for operating a roller mill (2) a controlling computer for a roller mill for rolling flat rolled goods.
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