How to convert cubic inches to US gallons
gal = in³ × 0.004329004329Because one US gallon equals 231 cubic inches, you can also divide: gal = in³ ÷ 231.
A cubic inch is smaller than an US gallon: it takes 231 cubic inches to make one US gallon.
Worked examples
- 1 cubic inch1 in³ × 0.004329004329 = 0.004329004329 gal
- 5 cubic inches5 in³ × 0.004329004329 = 0.02164502165 gal
- 10 cubic inches10 in³ × 0.004329004329 = 0.04329004329 gal
- 20 cubic inches20 in³ × 0.004329004329 = 0.08658008658 gal
- 100 cubic inches100 in³ × 0.004329004329 = 0.4329004329 gal
Cubic inches to US gallons conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Cubic inches (in³) | US gallons (gal) |
|---|---|
| 0.1 in³ | 0.00043290043 gal |
| 0.25 in³ | 0.0010822511 gal |
| 0.5 in³ | 0.0021645022 gal |
| 1 in³ | 0.0043290043 gal |
| 2 in³ | 0.0086580087 gal |
| 3 in³ | 0.012987013 gal |
| 4 in³ | 0.017316017 gal |
| 5 in³ | 0.021645022 gal |
| 6 in³ | 0.025974026 gal |
| 7 in³ | 0.03030303 gal |
| 8 in³ | 0.034632035 gal |
| 9 in³ | 0.038961039 gal |
| 10 in³ | 0.043290043 gal |
| Cubic inches (in³) | US gallons (gal) |
|---|---|
| 12 in³ | 0.051948052 gal |
| 15 in³ | 0.064935065 gal |
| 20 in³ | 0.086580087 gal |
| 25 in³ | 0.10822511 gal |
| 30 in³ | 0.12987013 gal |
| 40 in³ | 0.17316017 gal |
| 50 in³ | 0.21645022 gal |
| 75 in³ | 0.32467532 gal |
| 100 in³ | 0.43290043 gal |
| 250 in³ | 1.0822511 gal |
| 500 in³ | 2.1645022 gal |
| 1,000 in³ | 4.3290043 gal |
About the units
Cubic inch (in³)
The cubic inch (in³) is a unit of volume in the US customary system. One cubic inch equals 0.000016387064 cubic meters (m³).
US gallon (gal)
Defined as 231 cubic inches, exactly 3.785411784 L. US fuel, milk and paint are sold by the gallon. Four quarts or 128 US fluid ounces. One US gallon equals 0.003785411784 cubic meters (m³).
Frequently asked questions
How many US gallons are in one cubic inch?
There are 0.004329004329 US gallons in one cubic inch, and this value is exact by definition.
How do I convert cubic inches to US gallons?
Multiply the number of cubic inches by 0.004329004329. For example, 10 in³ × 0.004329004329 = 0.04329004329 gal.
How many cubic inches are in one US gallon?
One US gallon equals 231 cubic inches. That is the reverse factor, 1 ÷ 0.004329004329.
What is 10 cubic inches in US gallons?
10 in³ = 0.04329004329 gal.
Is this in³ to gal converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.
Convert cubic inches to other units
- Cubic inches to liters
- Cubic inches to milliliters
- Cubic inches to cubic meters
- Cubic inches to cubic centimeters
- Cubic inches to cubic feet
- Cubic inches to cubic yards
- Cubic inches to imperial gallons
- Cubic inches to barrels
Convert other units to US gallons
- Liters to US gallons
- Milliliters to US gallons
- US quarts to US gallons
- US cups to US gallons
- US fluid ounces to US gallons
- US tablespoons to US gallons
- US teaspoons to US gallons
- US pints to US gallons
- Metric cups to US gallons
- Imperial gallons to US gallons
- Imperial pints to US gallons
- Cubic meters to US gallons
- Cubic centimeters to US gallons
- Cubic feet to US gallons
- Cubic yards to US gallons
- Barrels to US gallons