In present research work, biodiesels of soybean, cottonseed, sesame, mustard and sunflower oils were prepared. The fuel properties such as saponification value, iodine value, cetane number and heat of combustion of pure biodiesels and blends of biodiesel with acetone in varying percentage were investigated. From the obtained results shows that, the fuel properties such as saponification value, iodine value, cetane number and heat of combustion of pure biodiesels were improved by acetone additive. Hence, from the present research work it is concluded that acetone may be used as better alternative additive to improve the fuel properties of biodiesels.