Convert Cubic Inches to Gallons

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

Results in Gallons:
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1 in³ = 0.004329 gal

How to Convert Cubic Inches to Gallons

Calculators can be used to convert measurements from one unit to another

To convert a cubic inch measurement to a gallon measurement, multiply the volume by the conversion ratio. One cubic inch is equal to 0.004329 gallons, so use this simple formula to convert:

gallons = cubic inches × 0.004329

The volume in gallons is equal to the cubic inches multiplied by 0.004329.

For example, here's how to convert 5 cubic inches to gallons using the formula above.
5 in³ = (5 × 0.004329) = 0.021645 gal

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

Cubic Inches

The cubic inch is a unit of volume that is equal to the space consumed by a cube with sides that are one inch in all directions.

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.


The US liquid gallon is a unit of fluid volume equal to four quarts, eight pints, or sixteen cups. 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 Inch Measurements and Equivalent Gallon Conversions

Common cubic inch values converted to the equivalent gallon value
Cubic Inches Gallons
1 in³ 0.004329 gal
2 in³ 0.008658 gal
3 in³ 0.012987 gal
4 in³ 0.017316 gal
5 in³ 0.021645 gal
6 in³ 0.025974 gal
7 in³ 0.030303 gal
8 in³ 0.034632 gal
9 in³ 0.038961 gal
10 in³ 0.04329 gal
11 in³ 0.047619 gal
12 in³ 0.051948 gal
13 in³ 0.056277 gal
14 in³ 0.060606 gal
15 in³ 0.064935 gal
16 in³ 0.069264 gal
17 in³ 0.073593 gal
18 in³ 0.077922 gal
19 in³ 0.082251 gal
20 in³ 0.08658 gal
21 in³ 0.090909 gal
22 in³ 0.095238 gal
23 in³ 0.099567 gal
24 in³ 0.103896 gal
25 in³ 0.108225 gal
26 in³ 0.112554 gal
27 in³ 0.116883 gal
28 in³ 0.121212 gal
29 in³ 0.125541 gal
30 in³ 0.12987 gal
31 in³ 0.134199 gal
32 in³ 0.138528 gal
33 in³ 0.142857 gal
34 in³ 0.147186 gal
35 in³ 0.151515 gal
36 in³ 0.155844 gal
37 in³ 0.160173 gal
38 in³ 0.164502 gal
39 in³ 0.168831 gal
40 in³ 0.17316 gal

More Cubic Inch Volume Conversions

US Liquid
Convert to Quarts
1 in³ is equal to 0.017316 quarts
Convert to Pints
1 in³ is equal to 0.034632 pints
Convert to Fluid Ounces
1 in³ is equal to 0.554113 fluid ounces
US Cooking
Convert to Cups
1 in³ is equal to 0.069264 cups
Convert to Tablespoons
1 in³ is equal to 1.108225 tablespoons
Convert to Teaspoons
1 in³ is equal to 3.324675 teaspoons
US Customary Volume
Convert to Cubic Feet
1 in³ is equal to 0.000579 cubic feet
Convert to Cubic Yards
1 in³ is equal to 2.1433E-5 cubic yards
Metric Volume
Convert to Liters
1 in³ is equal to 0.016387 liters
Convert to Milliliters
1 in³ is equal to 16.387064 milliliters
Convert to Cubic Centimeters
1 in³ is equal to 16.387064 cubic centimeters
Convert to Cubic Meters
1 in³ is equal to 1.6387E-5 cubic meters