An expression for threshold pumping intensity producing stimulated Raman scattering (SRS) have been derived on the basis of the energy conservation law. Energetic thresholds for SRS in drops have been calculated as functions of their radii under conditions of resonant excitation of SRS by laser radiation. The results have been compared with the available experimental data. It has been found that the SRS threshold depends ambiguously on a drop radius for a given type of resonant modes maintaining the SRS.