- How many gallons is 2 bbl?
Beer Barrel to Gallon Conversion TableBeer BarrelsGallons1 bbl312 bbl623 bbl934 bbl124

- How do you calculate bbl?
Thus, the volume of a barrel is equal to the height h times π times two times the middle radius r2 squared, plus the top/bottom radius r1 squared, divided by three.