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