Barrel Volume Calculator

Volume (m³):

Volume (U.S. Gallons):

Volume (Imp. Gallons):

Volume (Liters):

Volume (Cubic Feet):

Volume (bbl):

Volume Calculation

The volume of a barrel is calculated using the formula:

\[ \text{Volume} = \frac{h \times \pi \times \left(1.25 \times r_2^2 + r_1^2\right)}{3} \]

\[ \text{Volume} = \frac{h \times \pi \times \left(2 \times r_2^2 + r_1^2\right)}{3} \]

Where:

h = Barrel height
r₁ = Top/Bottom radius
r₂ = Middle radius
The difference in this formula is a larger multiple applied to the middle radius.

Type	Tight-Head	Open-Head	Tight-Head	Open-Head	Tight-Head	Open-Head
Material	STEEL	STEEL	PLASTIC	PLASTIC	FIBER	FIBER
Outside Height	33”	34-3/4”	34-3/4”	36-3/4”	-	35-1/2”
Outside Diameter	23”	24-1/2”	23-1/4”	22-7/8”	-	22-3/8”
These are all approximate dimensions. They’ll vary slightly from manufacturer to manufacturer, and from style to style.