Barrels (oil) to cubic kilometers converter on this page calculates how many cubic kilometers are in 'X' barrels (oil) (where 'X' is the number of barrels (oil) to convert to cubic kilometers). In order to convert a value from barrels (oil) to cubic kilometers (from bbl to km³) simply type the number of bbl to be converted to km³ and then click on the 'convert' button.