Convert US gallons to cubic inches
1 US gallon = 231 cubic inches · in³ = gal × 231
When you need this conversion
This conversion goes from US gallons, the fuel and liquid volume unit in the US, to cubic inches, used for engine displacement and small volumes. Both measure the same physical quantity, so the conversion is exact — the difference is which unit your source, tool, or region happens to use.
US gallons to cubic inches conversion table
| US gallons (gal) | Cubic inches (in³) |
|---|---|
| 1 gal | 231 in³ |
| 2 gal | 462 in³ |
| 3 gal | 693 in³ |
| 5 gal | 1,155 in³ |
| 10 gal | 2,310 in³ |
| 15 gal | 3,465 in³ |
| 20 gal | 4,620 in³ |
| 25 gal | 5,775 in³ |
| 50 gal | 11,550 in³ |
| 75 gal | 17,325 in³ |
| 100 gal | 23,100 in³ |
| 250 gal | 57,750 in³ |
| 500 gal | 115,500 in³ |
| 1,000 gal | 231,000 in³ |
The formula
in³ = gal × 231Because both units measure volume, the conversion is a single multiplication by a fixed factor. That factor never changes, so the result is exact.
Convert the other way
Cubic inches to US gallons →Related volume conversions
- US gallons to liters
- Milliliters to US cups
- Milliliters to US fluid ounces
- Liters to cubic meters
- Liters to US gallons
- Cubic meters to liters
- Cubic meters to cubic feet
- Cubic feet to cubic meters
- US cups to milliliters
- US fluid ounces to milliliters
- Milliliters to cubic inches
- Liters to cubic inches
Frequently asked questions
- How many cubic inches are in a US gallon?
- There are 231 cubic inches in 1 US gallon. The formula is in³ = gal × 231.
- How do you convert US gallons to cubic inches?
- Use the formula in³ = gal × 231. For example, 10 US gallons equals 2,310 cubic inches.
- Is the US gallons to cubic inches conversion exact?
- Yes. US gallons and cubic inches are both units of volume, related by an exact defined factor. Displayed results are rounded for readability.
- What is gal short for?
- gal is the standard symbol for US gallon (also written as gallons). in³ is the symbol for cubic inch.