The biodiesel is quite similar to conventional diesel fuel in its physical characteristics and can be used alone or mixed in any ratio with petroleum based diesel fuel in most existing modern four-stroke combustion ignition diesel engines with very few technical adjustments or no modification. Biodiesel as a neat can be used as a direct substitute for petro diesel and is technically called B100.The reaction is catalyzed by NaOH making this process economically viable for the industrial scale production of biodiesel. Biodiesel is an excellent product as it is environmentally friendly. Chromatogram GC-MS analysis showed 12 peaks were detected as methyl esters of fatty acids in Biodiesel coconut oil but there is only one a prominent peak that has great intensity.