Barrels (US dry) to board-feet conversion calculator above calculates how many board-feet are in 'X' barrels (US dry) (where 'X' is the number of barrels (US dry) to convert to board-feet). In order to convert a value from barrels (US dry) to board-feet (from bl to fbm) simply type the number of bl to be converted to fbm and then click on the 'convert' button.