Petroleum is a non-renewable energy source that is limited and eventually runs out if it is used continuously. In order to produce bio-diesel, plant seeds are processed and used as a feedstock. This process is made possible by both the storage of resources and the rise in the price of gasoline. In terms of sulphate content, flash point, and biodegradability, biodiesel is superior to petroleum diesel. In this work, an effort has been made to prepare biodiesel manufactured from trans-esterified pongamia pinnata, mahualongifolia, and rice bran. It doesn’t include sulphur aromatic compounds. It is biodegradable and harmless. The trans-esterification reaction that produces biodiesel is catalysed by an acid, alkali, or enzymatic catalyst.