Gallons to Cubic Inches Converter
Enter the volume in gallons below to convert it to cubic inches.
Convert Gallons (US) to Cubic Inches
Enter a value in gallons (us) (gal (US)) to convert to cubic inches (in³).
Gallon to Cubic Inch Conversion Table
Table showing various gallon measurements converted to cubic inches. Click any preset value or arrow to load it into the converter.
How to Convert Gallons to Cubic Inches
To convert gallons to 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:
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.
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.
Our gallon to cubic inch calculator automatically converts your volume measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Gallons and cubic inches are both units used to measure volume. Keep reading to learn more about each unit.
What Is a Gallon?
A gallon is a unit of volume equal to 3.7854118 liters (L), the base unit for volume. US liquid gallon defined as exactly 231 cubic inches (3.78541 L). [1]
The gallon is classified as a US customary unit of volume. Gallons can be abbreviated as gal (US); for example, 1 gallon can be written as 1 gal (US).
When working with gallons (gal (US)) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, gallons (gal (US)) are widely used across standard volume applications within US customary workflows, engineering documentation, and technical data sheets.
What Is a Cubic Inch?
A cubic inch is a unit of volume equal to 0.0163871 liters (L), the base unit for volume. Equal to 16.387064 milliliters. [2]
The cubic inch is classified as a US customary and imperial unit of volume. Cubic Inches can be abbreviated as in³; for example, 1 cubic inch can be written as 1 in³.
When working with cubic inches (in³) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, cubic inches (in³) are widely used across standard volume applications within US customary and imperial workflows, engineering documentation, and technical data sheets.
When converting volume between gallons (gal (US)) and cubic inches (in³), keep full floating-point precision (1 gal (US) = 231 in³; 1 in³ = 0.004329 gal (US)) during intermediate calculations and round only the final cubic inch figure to match your instrument tolerance.
More Gallon & Cubic Inch Conversions
Need to calculate in the opposite direction? Use our cubic inches to gallons (us) converter (in³ to gal (US)) to switch your starting unit immediately. You can also explore related tools such as converting liters to cubic inches, converting gallons (us) to liters, or converting gallons (us) to quarts (us).
Convert from Gallons
Weight and volume require ingredient density (g/mL). Choose a USDA FoodData Central verified ingredient below:
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Volume)·Volume & Liquid Metrology Standard — Gallons (US) (gal (US)) to Cubic Inches (in³)
- [2]NIST HB 44 SpecificationNIST HB 44 (Liquid & Dry Capacity Tables)·Unit Specifications: Gallon (US Liquid) (gal (US)) & Cubic Inch (in³)
- [3]NIST SP 811 ReferenceNIST SP 811 (NIST SP 811 App. B.9)·Conversion Factors & Mathematical Basis (gal (US) to in³)