Convert cubic inches to US gallons and gallons to cubic inches instantly. Bidirectional volume converter with formula and common values.
To convert cubic inches to US gallons, divide by 231 (or multiply by 0.004329). The US gallon is defined as exactly 231 cubic inches.
| Cubic Inches | Gallons |
|---|---|
| 57.75 | 0.25 |
| 115.5 | 0.5 |
| 231 | 1 |
| 462 | 2 |
| 693 | 3 |
| 1155 | 5 |
| 1848 | 8 |
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One cubic inch equals approximately 0.004329 US gallons.
One US gallon equals exactly 231 cubic inches.
Divide the number of cubic inches by 231. For example, 231 in³ ÷ 231 = 1 gallon.
The US gallon is historically defined as the volume of a cylinder 7 inches in diameter and 6 inches tall, which gives approximately 231 cubic inches.