Enter a barrel's diameter and height to calculate its volume and capacity.
How to Use the Barrel Volume and Capacity Calculator
Enter the barrel's diameter and height. Its volume comes out in liters, US gallons, and cubic feet together.
volume = π × (diameter ÷ 2)² × heightA barrel is just a cylinder for the purposes of this formula — the classic wooden wine barrel's bulge doesn't factor in here, only straight-sided drums and tanks measure accurately this way. The standard oil barrel (42 US gallons) and the common steel drum (55 US gallons) are both specific real-world sizes that happen to fit this same cylindrical formula; check the manufacturer's dimensions rather than assuming a "barrel" always means one of those two capacities.