Barrel (US) to Gallon (US) Converter

Volume Converter

40 units available

Decimals:

From

To

31.5

1 bbl (US) = 31.5 gal

Formula:

gal = bbl (US) × 31.5

With your value: 1 bbl (US) = 31.5 gal

How big is that?

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

Milk carton (1/1.2e+5 your value)0.00000839 bbl (US)

Kitchen bucket (1/1.2e+4 your value)0.0000839 bbl (US)

Car fuel tank (1/2.4e+3 your value)0.000419 bbl (US)

Bathtub (1/6.0e+2 your value)0.00168 bbl (US)

Hot tub (1/79 your value)0.0126 bbl (US)

Your value1.00 bbl (US)

Other Barrel (US) to Gallon (US) conversions

2 bbl (US) to gal 3 bbl (US) to gal 4 bbl (US) to gal 5 bbl (US) to gal 6 bbl (US) to gal 7 bbl (US) to gal 8 bbl (US) to gal

Barrel (US) to Gallon (US) Conversion Table

Barrel (US) (bbl (US))	Gallon (US) (gal)
0.5	15.75
1	31.5
2	63
5	157.5
10	315
15	472.5
20	630
25	787.5
50	1,575
100	3,150
250	7,875
500	15,750
1000	31,500

Gallon (US) to Barrel (US) Conversion Table

Gallon (US) (gal)	Barrel (US) (bbl (US))
0.5	0.015873
1	0.031746
2	0.063492
5	0.15873
10	0.31746
15	0.47619
20	0.634921
25	0.793651
50	1.587302
100	3.174603
250	7.936508
500	15.873016
1000	31.746032

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 (US) (bbl (US))

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 (US) to Gallon (US)

To convert from Barrel (US) (bbl (US)) to Gallon (US) (gal), multiply the value by 31.5.

Formula: gal = bbl (US) × 31.5

Reverse: bbl (US) = gal × 0.0317460317

Step-by-Step Example

Start with your value in Barrel (US). For example: 5 bbl (US)
Multiply by the conversion factor: 5 x 31.5
The result is: 157.5 gal

About Barrel (US)

The barrel (us) (bbl (US)) is a unit of volume and capacity. One barrel (us) equals 119.2404712 litres. UnitConvertLab converts it against every other volume unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: volume calculations, engineering and science, education.

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 (US)?

There are exactly 31.5 Gallon (US) in 1 Barrel (US). This means the conversion factor from Barrel (US) to Gallon (US) is 31.5.

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

The formula to convert Barrel (US) to Gallon (US) is: gal = bbl (US) × 31.5. For example, to convert 10 Barrel (US) to Gallon (US), you would multiply 10 by 31.5.

What is a Barrel (US)?