Gallon (US) to Cubic Inch Converter

Volume Converter

40 units available

Decimals:

From

To

231

1 gal = 231 in³

Formula:

in³ = gal × 231

With your value: 1 gal = 231 in³

How big is that?

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

Milk carton (1/3.8e+3 your value)0.000264 gal

Kitchen bucket (1/3.8e+2 your value)0.00264 gal

Car fuel tank (1/76 your value)0.0132 gal

Bathtub (1/19 your value)0.0528 gal

Hot tub (1/2.5 your value)0.396 gal

Your value1.00 gal

Other Gallon (US) to Cubic Inch conversions

2 gal to in³ 3 gal to in³ 4 gal to in³ 5 gal to in³ 6 gal to in³ 7 gal to in³ 8 gal to in³

Gallon (US) to Cubic Inch Conversion Table

Gallon (US) (gal)	Cubic Inch (in³)
0.5	115.5
1	231
2	462
5	1,155
10	2,310
15	3,465
20	4,620
25	5,775
50	11,550
100	23,100
250	57,750
500	115,500
1000	231,000

Cubic Inch to Gallon (US) Conversion Table

Cubic Inch (in³)	Gallon (US) (gal)
0.5	0.002165
1	0.004329
2	0.008658
5	0.021645
10	0.04329
15	0.064935
20	0.08658
25	0.108225
50	0.21645
100	0.4329
250	1.082251
500	2.164502
1000	4.329004

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.

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

Cubic Inch (in³)

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

How to Convert Gallon (US) to Cubic Inch

To convert from Gallon (US) (gal) to Cubic Inch (in³), multiply the value by 231.

Formula: in³ = gal × 231

Reverse: gal = in³ × 0.0043290043

Step-by-Step Example

Start with your value in Gallon (US). For example: 5 gal
Multiply by the conversion factor: 5 x 231
The result is: 1,155 in³

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.

About Cubic Inch

The cubic inch (in³) is a unit of volume and capacity. One cubic inch equals 0.016387064 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.

Frequently Asked Questions

How many Cubic Inch are in 1 Gallon (US)?

There are exactly 231 Cubic Inch in 1 Gallon (US). This means the conversion factor from Gallon (US) to Cubic Inch is 231.

What is the formula to convert Gallon (US) to Cubic Inch?

The formula to convert Gallon (US) to Cubic Inch is: in³ = gal × 231. For example, to convert 10 Gallon (US) to Cubic Inch, you would multiply 10 by 231.

What is a Gallon (US)?