Method for estimation of a mean torque generated by a combustion engine with at least two cylinders, comprising to generate an engine speed vector, wherein several measuring values representing the instantaneous engine speed of the engine, are registered, to determine the respective n:th highest and the n:th lowest value of the engine speed vector, where 2≦n≦x/2, where x is the number of measuring values associated with the respective cylinder in the engine speed vector, to calculate the difference between the two values determined in step b, to generate a signal E representing the differences obtained as function of time, and to estimate the torque generated by the motor as a function T dependent at least on the signal E.