This paper presents the novel method of automatic calculation for estimating the medium-wave broadcast service area and the equifield intensity area. The numerical calculation presented here consists of the Norton's approximate equation and the Millington method, and is applicable to the complicated mixed propagating path. The computer simulation shows that this method is effective to estimate both the medium-wave broadcast service area and the equifield intensity area easily utiliz-ing the earth conductivity date along the propagation path.
