Cubic inches (in³) to US gallons (gal) Conversion
Cubic inches
The cubic inch is a unit of volume in the US customary and imperial systems equal to exactly 16.387 mL (the cube of 2.54 cm). Engine displacement in the United States is traditionally expressed in cubic inches: a 350 cubic inch V8 engine. It is also used in packaging, woodworking, and small industrial parts specifications.
US gallons
The US liquid gallon is a unit of volume equal to exactly 3.785411784 litres, used primarily in the United States for fuel sales, beverage containers, and agricultural applications. It is divided into 4 quarts, 8 pints, or 128 fluid ounces. The US gallon is approximately 16.7% smaller than the imperial (UK) gallon — a difference with significant implications in fuel economy comparisons and recipe conversions.
| Cubic inches (in³) | US gallons (gal) |
|---|---|
| 0.1 in³ | 0.000433 gal |
| 1 in³ | 0.00433 gal |
| 2 in³ | 0.00866 gal |
| 3 in³ | 0.013 gal |
| 5 in³ | 0.0216 gal |
| 10 in³ | 0.0433 gal |
| 20 in³ | 0.0866 gal |
| 30 in³ | 0.1299 gal |
| 50 in³ | 0.2165 gal |
| 100 in³ | 0.4329 gal |
| 1000 in³ | 4.329 gal |
Frequently Asked Questions (FAQ)
How many US gallons are in 1 cubic inches?
1 cubic inches (in³) is exactly 0.004329 US gallons (gal).
How do I convert cubic inches to US gallons?
Multiply the value in cubic inches by 0.004329 to get the result in US gallons. Or use the converter above — type any number and see the result instantly.