This calculator allows you to convert from Fuel oil equivalent @barrel (US) to Btu (th) and in a reverse direction. To convert from Fuel oil equivalent @barrel (US) to Btu (th), enter the amount of Fuel oil equivalent @barrel (US) into the first input and to convert from Btu (th) to Fuel oil equivalent @barrel (US), enter the amount of Btu (th) into the second input.