 Biodiesel has gained popularity due to its environmental benefits and availability from renewable resources. Studies have shown that biodiesel is a better fuel than fossil-derived diesel in terms of engine performance, emissions reduction, lubricity and environmental benefits. The increasing demand for commercial production methods calls for the development of efficient process technologies. This paper explores the use of ultrasound in optimizing the transesterification conversion of waste cooking oil to biodiesel. The results show that the conversion efficiency using ultrasound is higher than with mechanical stirring. The optimal variables for transesterification via ultrasound are a 6-to-1 methanol-slash-oil ratio, a reaction temperature of 30 degrees Celsius, a reaction time of 30 minutes, and a catalyst concentration of 0.75% KOH, WT-slash-WT. This article was authored by Farouk Amir, Leslie Petrick, Bamakol Amigun and others. We are article.tv, links in the description below.