Acre-inches to barrels (oil) converter above calculates how many barrels (oil) are in 'X' acre-inches (where 'X' is the number of acre-inches to convert to barrels (oil)). In order to convert a value from acre-inches to barrels (oil) (from ac in to bbl) simply type the number of ac in to be converted to bbl and then click on the 'convert' button.