Barrels (oil) to cubic decameters conversion calculator shown above calculates how many cubic decameters are in 'X' barrels (oil) (where 'X' is the number of barrels (oil) to convert to cubic decameters). In order to convert a value from barrels (oil) to cubic decameters (from bbl to dam³) just type the number of bbl to be converted to dam³ and then click on the 'convert' button.