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Home » Math & Conversions » Unit Conversions » Barrels to Gallons Converter Barrels to Gallons Converter The term "barrel" is ambiguous. Select the type of barrel you want to convert to instantly see the result in US gallons. Select Barrel Type: US Oil Barrel (bbl) US Liquid Barrel US Beer Barrel US Dry Barrel UK (Imperial) Barrel Barrels US Gallons (Liquid) Which "Barrel" Are You Converting? Unlike units like "meter" or "kilogram," the "barrel" is not a single defined unit. Its volume depends entirely on the context. Our calculator defaults to the **US Oil Barrel**, which is the most common international standard, but you may be referring to one of several others. Conversion Formulas Here are the exact conversion factors used by this calculator: 1 US Oil Barrel (bbl) = 42 US Gallons This is the standard for measuring crude oil and other petroleum products. 1 US Liquid Barrel = 31.5 US Gallons This is a less common standard, sometimes used for other liquids like chemicals or food products. 1 US Beer Barrel = 31 US Gallons This unit is legally defined in the US for tax purposes related to beer. 1 US Dry Barrel = 105 dry quarts (28.378 US Gallons) Used for some dry goods. 1 UK (Imperial) Barrel = 36 Imperial Gallons (43.234 US Gallons) Used in the United Kingdom. Note that an Imperial gallon is larger than a US gallon. Conversion Table (Oil Barrels) This table shows the conversion for the most common unit, the US Oil Barrel (bbl). US Oil Barrels (bbl) US Gallons 1 bbl 42 gal 2 bbl 84 gal 5 bbl 210 gal 10 bbl 420 gal 50 bbl 2,100 gal 100 bbl 4,200 gal Frequently Asked Questions (FAQ) How many gallons are in a barrel of oil? There are exactly **42 US gallons** in one standard barrel of oil (bbl). How many gallons are in a barrel of beer? In the United States, a standard barrel of beer is **31 US gallons**. This is different from a "keg," which is typically a half-barrel (15.5 gallons). Why is an oil barrel 42 gallons? The 42-gallon standard dates back to the 1870s in Pennsylvania. Early oil producers used 42-gallon wooden barrels (originally used for whiskey) for transport. This size became the standard for the industry to avoid disputes and ensure consistent measurement for trade. Related Calculators Millimeters to Inches Converter Typography Unit Converter (px, pt, em, rem, %) Kilograms to Pounds Converter Centimeters to Inches Converter BTU to kWh Converter Angstroms to Nanometers Converter Kelvin to Fahrenheit Converter Degrees to Radians Converter Cups to Tablespoons Converter Meters to Nanometers Converter
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