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Exact relationship and formula
1 cubic foot = 1,728 cubic inches exactly and 1 U.S. liquid gallon = 231 cubic inches exactly. Therefore 1 ft³ = 576/77 U.S. gallons exactly.
Reverse mode applies the inverse relationship from the same exact definition.
Worked example
1 ft³ ≈ 7.48051948052 US gal; 10 ft³ ≈ 74.8051948052 US gal; 1 US gal ≈ 0.133680555556 ft³.
This converts already-known volume, not linear feet. Gallon means U.S. liquid gallon; Imperial and dry gallons are different definitions.
Common cubic feet reference values
| Cubic feet | Conversion |
|---|---|
| 0.5 ft³ | 3.74025974026 US gal |
| 1 ft³ | 7.48051948052 US gal |
| 2 ft³ | 14.961038961 US gal |
| 5 ft³ | 37.4025974026 US gal |
| 10 ft³ | 74.8051948052 US gal |
| 25 ft³ | 187.012987013 US gal |
| 100 ft³ | 748.051948052 US gal |
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