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The ratio of shear viscosity (η) to entropy density (s) for an equilibrated system is investigated in intermediate energy heavy ion collisions below 100A MeV within the framework of the Boltzmann-Uehling-Uhlenbeck (BUU) model . After the collision system almost reaches a local equilibration, the temperature, pressure and energy density are obtained from the phase space information and η/s is calculated using the Green-Kubo formulas. The results show that η/s decreases with incident energy and tend towards a smaller value around 0.5, which is not so drastically different from the BNL Relativistic Heavy Ion Collider results in the present model. 66.20.Cy