Barrel (Oil) to Gallon (US) Converter

Volume Converter

40 units available

Decimals:

From

To

42

1 bbl = 42 gal

Formula:

gal = bbl × 42

With your value: 1 bbl = 42 gal

How big is that?

Everyday references on a logarithmic scale, all expressed in barrel (oil) so you can sanity-check the result.

Milk carton (1/1.6e+5 your value)0.00000629 bbl

Kitchen bucket (1/1.6e+4 your value)0.0000629 bbl

Car fuel tank (1/3.2e+3 your value)0.000314 bbl

Bathtub (1/7.9e+2 your value)0.00126 bbl

Hot tub (1/1.1e+2 your value)0.00943 bbl

Your value1.00 bbl

Other Barrel (Oil) to Gallon (US) conversions

2 bbl to gal 3 bbl to gal 4 bbl to gal 5 bbl to gal 6 bbl to gal 7 bbl to gal 8 bbl to gal

Barrel (Oil) to Gallon (US) Conversion Table

Barrel (Oil) (bbl)	Gallon (US) (gal)
0.5	21
1	42
2	84
5	210
10	420
15	630
20	840
25	1,050
50	2,100
100	4,200
250	10,500
500	21,000
1000	42,000

Gallon (US) to Barrel (Oil) Conversion Table

Gallon (US) (gal)	Barrel (Oil) (bbl)
0.5	0.011905
1	0.02381
2	0.047619
5	0.119048
10	0.238095
15	0.357143
20	0.47619
25	0.595238
50	1.190476
100	2.380952
250	5.952381
500	11.904762
1000	23.809524

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Barrel (Oil) (bbl)

Volume

Exact conversion

Derived from the cubic metre. The litre is exactly 10⁻³ m³; US and imperial capacity units are exact multiples fixed by statute.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Gallon (US) (gal)

Volume

Exact conversion

The US liquid gallon is exactly 231 cubic inches = 3.785 411 784 L.

Source: NIST Handbook 44, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Barrel (Oil) to Gallon (US)

To convert from Barrel (Oil) (bbl) to Gallon (US) (gal), multiply the value by 42.

Formula: gal = bbl × 42

Reverse: bbl = gal × 0.0238095238

Step-by-Step Example

Start with your value in Barrel (Oil). For example: 5 bbl
Multiply by the conversion factor: 5 x 42
The result is: 210 gal

About Barrel (Oil)

The oil barrel equals 42 US gallons (about 158.987 litres) and is the global pricing unit for crude petroleum.

Fun Fact: The 42-gallon standard dates to the 1860s Pennsylvania oil rush.

Common uses: crude oil pricing, energy statistics.

About Gallon (US)

The US gallon equals approximately 3.785 liters and is the standard unit for fuel and large liquid volumes in the United States.

Fun Fact: The US gallon is about 20% smaller than the imperial (UK) gallon.

Common uses: fuel (US), beverages, swimming pools.

Frequently Asked Questions

How many Gallon (US) are in 1 Barrel (Oil)?

There are exactly 42 Gallon (US) in 1 Barrel (Oil). This means the conversion factor from Barrel (Oil) to Gallon (US) is 42.

What is the formula to convert Barrel (Oil) to Gallon (US)?

The formula to convert Barrel (Oil) to Gallon (US) is: gal = bbl × 42. For example, to convert 10 Barrel (Oil) to Gallon (US), you would multiply 10 by 42.

What is a Barrel (Oil)?