A set of issues related to the calculation of reinforced concrete bridges for all purposes was considered. Information on calculation of sections, individual elements and complete spans is given. The main provisions of the calculations are given in accordance with SNiP 2.05.03-84 "Bridges and pipes," as well as SNiP 2.03.01-Ya "Concrete and reinforced concrete structures." At the same time, the latest achievements in the field of the theory of reinforced concrete and methods of calculating building structures are taken into account. Much attention is paid to the calculation of bridges of complex systems.