Gallons to Cubic Inches Conversion
Enter the volume in gallons below to get the value converted to cubic inches.
How to Convert Gallons to Cubic Inches

To convert a gallon measurement to a cubic inch measurement, multiply the volume by the conversion ratio. One gallon is equal to 231 cubic inches, so use this simple formula to convert:
The volume in cubic inches is equal to the gallons multiplied by 231.
Gallons and cubic inches are both units used to measure volume. Keep reading to learn more about each unit of measure.
Gallons
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.
Cubic Inches
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.[2]
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.
Gallon to Cubic Inch Conversion Table
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 |
References
- National Institute of Standards and Technology, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices, Handbook 44 - 2019 Edition, https://nvlpubs.nist.gov/nistpubs/hb/2019/NIST.HB.44-2019.pdf
- National Institute of Standards and Technology, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices, Handbook 44 - 2019 Edition, https://nvlpubs.nist.gov/nistpubs/hb/2019/NIST.HB.44-2019.pdf