Cubic Inch to Gallon (US) Converter

Volume Converter

40 units available

Decimals:

From

To

0.004329

1 in³ = 0.004329 gal

Formula:

gal = in³ × 0.0043290043

With your value: 1 in³ = 0.004329 gal

How big is that?

Everyday references on a logarithmic scale, all expressed in cubic inch so you can sanity-check the result.

Soda can (1/50 your value)0.0201 in³

Milk carton (1/16 your value)0.0610 in³

Kitchen bucket (1/1.6 your value)0.610 in³

Your value1.00 in³

Car fuel tank (3.1× your value)3.05 in³

Bathtub (12× your value)12.2 in³

Other Cubic Inch to Gallon (US) conversions

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

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

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

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.

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

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 Cubic Inch to Gallon (US)

To convert from Cubic Inch (in³) to Gallon (US) (gal), multiply the value by 0.0043290043.

Formula: gal = in³ × 0.0043290043

Reverse: in³ = gal × 231

Step-by-Step Example

Start with your value in Cubic Inch. For example: 5 in³
Multiply by the conversion factor: 5 x 0.0043290043
The result is: 0.021645 gal

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.

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 Cubic Inch?

There are exactly 0.0043290043 Gallon (US) in 1 Cubic Inch. This means the conversion factor from Cubic Inch to Gallon (US) is 0.0043290043.

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

The formula to convert Cubic Inch to Gallon (US) is: gal = in³ × 0.0043290043. For example, to convert 10 Cubic Inch to Gallon (US), you would multiply 10 by 0.0043290043.

What is a Cubic Inch?