Divide the number of barrels by 6.28981077 to convert to cubic meters. For example, if you have 2,500 bbl, divide 2,500 by 6.28981077 to get 397.47 m^3.
Multiply the number of barrels by 0.158987295 to convert to cubic meters. In this example, verify your answer by multiplying 2,500 by 0.158987295 to get 397.47 bbl.
Check your answer with an online barrels-to-cubic meters converter. Enter the number of barrels and the site displays the number of cubic meters.