The Mobile Ad-hoc NETworks (MANET) are the examples of infrastructure less networks and are having frequent occurrence of route discoveries. In MANET, the routing has been performed with the help of neighboring information. The route discovery of MANET suffers with the broadcast where it involves additional routing overhead with frequent transmission of broadcasting messages to neighbor nodes. This paper proposes new approach for reducing routing overhead for MANET. The propose reducing routing overhead approach computes for determing spread factor. Then the present paper proposes a method for calculating rebroadcast probability.