The effect of methanol to oil ratio was examined by varying the ratio from 6:1 to 15:1. Fig. 7 presents the biodiesel yield against the methanol to oil ratio. It was not possible to analyse the mixture at methanol to oil molar ratio of 3:1. The biodiesel yield increased significantly as the methanol to oil ratio increased. Below the ratio 12:1, the biodiesel yield was low as lower amount of methanol was insufficient to shift the equilibrium to the right [33]. Maximum conversion was obtained at methanol to oil ratio of 12:1. The conversion decreased with further increase of methanol to oil ratio.