Gallons to Cubic Inches Converter

Enter the volume in gallons below to get the value converted to cubic inches.

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1 gal = 231 in³

Do you want to convert cubic inches to gallons?

How to Convert Gallons to Cubic Inches

To convert a measurement in gallons to a measurement in cubic inches, multiply the volume by the following conversion ratio: 231 cubic inches/gallon.

Since one gallon is equal to 231 cubic inches, you can use this simple formula to convert:

cubic inches = gallons × 231

The volume in cubic inches is equal to the volume in gallons multiplied by 231.

For example, here's how to convert 5 gallons to cubic inches using the formula above.
cubic inches = (5 gal × 231) = 1,155 in³

How Many Cubic Inches Are in a Gallon?

There are 231 cubic inches in a gallon, which is why we use this value in the formula above.

1 gal = 231 in³

Gallons and cubic inches are both units used to measure volume. Keep reading to learn more about each unit of measure.

What Is a Gallon?

The US liquid gallon is a unit of fluid volume equal to four quarts, eight pints, or sixteen cups.[1] The US liquid gallon should not be confused with the US dry gallon or the imperial gallon, which are different units of measure.

The gallon is a US customary unit of volume. Gallons can be abbreviated as gal; for example, 1 gallon can be written as 1 gal.

Learn more about gallons.

What Is a Cubic Inch?

A cubic inch is a unit of volume equal to the space consumed by a cube with sides that are one inch in all directions. One cubic inch is equivalent to about 16.387 cubic centimeters or 0.554 fluid ounces.[1]

The cubic inch is a US customary and imperial unit of volume. A cubic inch is sometimes also referred to as a cubic in. Cubic inches can be abbreviated as in³, and are also sometimes abbreviated as cu inch, cu in, or CI. For example, 1 cubic inch can be written as 1 in³, 1 cu inch, 1 cu in, or 1 CI.

Learn more about cubic inches.

Gallon to Cubic Inch Conversion Table

Table showing various gallon measurements converted to cubic inches.
Gallons Cubic Inches
1 gal 231 in³
2 gal 462 in³
3 gal 693 in³
4 gal 924 in³
5 gal 1,155 in³
6 gal 1,386 in³
7 gal 1,617 in³
8 gal 1,848 in³
9 gal 2,079 in³
10 gal 2,310 in³
11 gal 2,541 in³
12 gal 2,772 in³
13 gal 3,003 in³
14 gal 3,234 in³
15 gal 3,465 in³
16 gal 3,696 in³
17 gal 3,927 in³
18 gal 4,158 in³
19 gal 4,389 in³
20 gal 4,620 in³
21 gal 4,851 in³
22 gal 5,082 in³
23 gal 5,313 in³
24 gal 5,544 in³
25 gal 5,775 in³
26 gal 6,006 in³
27 gal 6,237 in³
28 gal 6,468 in³
29 gal 6,699 in³
30 gal 6,930 in³
31 gal 7,161 in³
32 gal 7,392 in³
33 gal 7,623 in³
34 gal 7,854 in³
35 gal 8,085 in³
36 gal 8,316 in³
37 gal 8,547 in³
38 gal 8,778 in³
39 gal 9,009 in³
40 gal 9,240 in³


  1. National Institute of Standards and Technology, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices, Handbook 44 - 2019 Edition,

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