Gallons to Cubic Inches Conversion (gal to in³)

Gallons to Cubic Inches Converter

Enter the volume in gallons below to convert it to cubic inches.

Result in Cubic Inches:

1 gal = 231 in³

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

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

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