Find the cubic footage and also total volume the a barrel and find how plenty of gallons (or liters) space in the barrel.

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How to discover the Volume the a Barrel

A barrel is a ring container with a convex form that is wider in the center than in ~ the top and also bottom. They are normally made of wooden slats referred to as staves that space held together with metal hoops.

To find barrel volume, friend will require to know its height, radius at the top and also bottom, and also radius in the middle.

Barrel Volume Formula

Use the adhering to formula because that the complete volume of a barrel:

volume = h × π × ((2 × r22) + r12)3

Thus, the volume of a barrel is same to the elevation h times π times two times the center radius r2 squared, to add the top/bottom radius r1 squared, separated by three.


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To usage this formula, ensure the the height, top/bottom radius, and also middle radius values are all in the very same unit that measure; inches room most frequently used. Regularly barrel volume will be expressed in cubic feet or cubic meters, when barrel’s capacity will be expressed in gallons or liters.

If every dimensions used in the formula space in inches, climate the complete volume measurement will be in cubic inches.

To get the full volume in cubic feet, transform from cubic inches making use of the formula ft3 = in3 × 0.000578704. Use our cubic inches to cubic feet calculator to convert quickly.


Example: because that a 53-gallon whiskey barrel through a elevation of 36″, a top/bottom diameter of 21″, and also a middle diameter that 26″

top/bottom radius = 21 ÷ 2top/bottom radius = 10.5

middle radius = 26 ÷ 2middle radius = 13

volume = (h × π × ((2 × r22) + r12)) ÷ 3volume = (36 × π × ((2 × 132) + 10.52)) ÷ 3volume = (36 × π × ((2 × 169) + 110.25)) / 3volume = (36 × π × (338 + 110.25)) ÷ 3volume = (36 × π × 448.25) ÷ 3volume = 50,694.4 ÷ 3volume = 16,898.1 in316,898.1 in3 = 9.8 ft3

How countless Gallons are in a Barrel?

The capacity of a barrel is frequently measured in gallons. To find how numerous gallons room in the barrel, simply convert the total volume come gallons.

Gallons can be discovered using the cubic feet come gallons formula:gallons = ft3 × 7.480507.

Barrel Gallons Formula

Thus, the formula to find how countless gallons room in a barrel is:

gallons = h × π × ((2 × r22) + r12)3 × 7.480507

How plenty of Liters are in a Barrel?

You can uncover how numerous liters space in a barrel similar to finding gallons. Use the cubic feet to liters formula:liters = ft3 × 28.3168.

Barrel Liters Formula

Using the liters conversion above, the formula to uncover how plenty of liters are in a barrel is:

liters = h × π × ((2 × r22) + r12)3 × 28.3168

Common Barrel Sizes

Barrels come in countless shapes and sizes, but there space some typical sizes provided in industry. Barrels are generally used to save beverages such together wine, beer, and also liqueurs. They space also an extremely commonly provided to keep oil and chemicals.

The median size of a 53-gallon whiskey barrel is 36″ high v a top and also bottom diameter the 21″ and also a center diameter that 26″.

Historically oil to be stored in wood barrels that held 42 gallons of oil. That is why the modern-day standard of oil barrel volume supplied for pricing and also tax is 42 gallons.

In modern-day industry, oil and also chemicals room stored in metal drums, which space far an ext durable. Oil drums organize 55 gallons that fluid.

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Finding barrel volume is relevant as soon as measuring the lot of beverage it contains, i beg your pardon is helpful for beer-making, wine-making, and also measuring other beverages.