Cubic millimeter is said to be the volume of the cube of side length one millimeter. It is represented through mm3 which is also referred as micro-liter. A barrel is said to be one of several units which is applied in various contexts and this is represented as blue barrel (bbl). This calculator helps you to convert cubic millimeter to barrel in bbl.
A 500 mm3 of crude oil is equivalent to
BBL = 0.0000000063 x mm3
BBL = 0.000000063 x 500
BBL = 0.00000315