Cubic Inches to Gallons Converter
Enter the volume in cubic inches below to convert it to gallons.
Convert Cubic Inches to Gallons (US)
Enter a value in cubic inches (in³) to convert to gallons (us) (gal (US)).
Cubic Inch to Gallon Conversion Table
Table showing various cubic inch measurements converted to gallons. Click any preset value or arrow to load it into the converter.
| Cubic Inches (in³) | Gallons (US) (gal (US)) |
|---|---|
| 1 in³ | 0.004329 gal (US) |
| 2 in³ | 0.008658 gal (US) |
| 5 in³ | 0.021645 gal (US) |
| 10 in³ | 0.04329 gal (US) |
| 15 in³ | 0.0649351 gal (US) |
| 20 in³ | 0.0865801 gal (US) |
| 25 in³ | 0.1082251 gal (US) |
| 30 in³ | 0.1298701 gal (US) |
| 50 in³ | 0.2164502 gal (US) |
| 75 in³ | 0.3246753 gal (US) |
How to Convert Cubic Inches to Gallons
To convert cubic inches to gallons, multiply the volume by the following conversion ratio: 0.004329 gallons/cubic inch.
Since one cubic inch is equal to 0.004329 gallons, you can use this simple formula to convert:
The volume in gallons is equal to the volume in cubic inches multiplied by 0.004329.
For example, here's how to convert 231 cubic inches to gallons using the formula above.
How Many Gallons Are in a Cubic Inch?
There are 0.004329 gallons in a cubic inch, which is why we use this value in the formula above.
Our cubic inch to gallon calculator automatically converts your volume measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Cubic Inches and gallons are both units used to measure volume. Keep reading to learn more about each unit.
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. [1]
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.
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). [2]
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.
When converting volume between cubic inches (in³) and gallons (gal (US)), keep full floating-point precision (1 in³ = 0.004329 gal (US); 1 gal (US) = 231 in³) during intermediate calculations and round only the final gallon figure to match your instrument tolerance.
More Cubic Inch & Gallon Conversions
Need to calculate in the opposite direction? Use our gallons (us) to cubic inches calculator to switch your starting unit immediately. You can also explore related tools such as converting gallons (us) to cubic inches, converting liters to gallons (us), or converting quarts (us) to gallons (us).
Convert from Cubic Inches
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Volume)·Volume & Liquid Metrology Standard — Cubic Inches (in³) to Gallons (US) (gal (US))
- [2]NIST HB 44 SpecificationNIST HB 44 (Liquid & Dry Capacity Tables)·Unit Specifications: Cubic Inch (in³) & Gallon (US Liquid) (gal (US))
- [3]NIST SP 811 ReferenceNIST SP 811 (NIST SP 811 App. B.9)·Conversion Factors & Mathematical Basis (in³ to gal (US))