The research aims to analyze the cost efficiency of using three types of feed when rearing three different types of ducks. The benefits of this research are expected to provide information to researchers and the public, especially breeders, about the types of feed and types of ducks that are more cost efficient in the duck farming business. The research used three types of feed and three different types of ducks. This research uses an experimental method with a Completely Randomized Design (CRD) factorial pattern (3x3) with 3 replications consisting of two factors, namely factor A and factor B. Factor A is the type of feed, consisting of; A1 (BR1 feed), A2 (PP3 feed), A3 (Mix feed). Factor B is the type of duck, consisting of; B1 (Peking duck type), B2 (Mojosari duck type), B3 (MA duck type). The variables observed were efficient use of rations (FE), economic efficiency of ration use (EEPP) and feed cost per gain (FCG). The data obtained were analyzed for variance (ANOVA), the differences between treatments were carried out by the Duncan multiple range test (DMRT). The research results showed that there was no interaction in each treatment between factors A and B. Factor A showed a very significant effect (P > 0.01) on the cost efficiency of feed use. Meanwhile, factor B shows no real effect. The conclusion of this research is that the best cost efficiency for using rations is the PP3 type of ration with a more efficient type of duck, namely Peking Duck. Suggestions based on research results are for broiler duck fattening businesses to use Peking ducks with PP3 rations to produce maximum body weight and with efficient feed costs.