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Biodiesel production from the waste oils and fats are the cost effective methods and prevents the environmental pollution by proper disposal techniques. Converting waste oils/fat into biodiesel using alkaline catalyst is difficult, as it contains more than one percent Free Fatty Acid (FFA) which will form soap during the transesterification process. Hence, it is desirable to reduce the level of FFA lower than one percent for biodiesel production using the pre-treatment process. In the present research work, ferric sulfate (solid catalyst) is used as a catalyst, because it converts FFA efficiently than the homogeneous acid catalyst which is corrosive in nature and takes longer reaction time.