Abstract: A method for estimating the frequency of a time signal by means of a discrete Fourrier transformation and interpolation between support points of the DFT spectrum. According to said method, the hamming window is used in a known manner for filter and the interpolation is carried out according to the mathematically calculated solution. The method makes use of the pact that a function of the third degree which can serve as correction distance has a clear solution within the definition range of the amount ration between a secondary maximum and a primary maximum of the DFT spectrum. The correction distance is calculated according to this solution on the basis of the ratio of the secondary maximum and the primary maximum.