The invention relates to a method and arrangement for determining a current road inclination, specifically taking into account a quality measure for the determination. The invention also relates to a corresponding computer program product. The method comprises the steps of: —measuring (S1), a first vehicle operating parameter; —receiving (S2) the first vehicle operating parameter; —determining (S3) an indication of a quality level for the first vehicle operating parameter, and —determining (S4) an estimated value of the current road inclination based on the first vehicle operating parameter and the indication of the quality level for the first vehicle operating parameter.