Monopod bucket foundation is a promising foundation concept which was developed in the last decade to be used as the supporting structures for offshore wind turbines. In this study, a three-dimensional finite element modeling was used to evaluate ultimate horizontal load and moment capacities of monopod and tripod bucket foundations. Various foundation geometries installed in dense sandy soil were considered to obtain load-displacement and moment rotation curves. A comparison between the horizontal load and moment capacities of monopod and tripod bucket foundations was performed. Dimensionless variables for these foundation types were presented. The results show that the loading conditions and foundation geometries affect on the ultimate load and moment capacities.