Conversion
Cubic Feet to US gallons
1 ft³ = 7.48052 US gal, derived from exact unit definitions.
—
Swap ⇆| ft³ | US gal |
|---|---|
| 1 ft³ | 7.48 US gal |
| 2 ft³ | 14.96 US gal |
| 5 ft³ | 37.40 US gal |
| 7.48 ft³ | 55.95 US gal |
| 10 ft³ | 74.81 US gal |
| 25 ft³ | 187.01 US gal |
| 50 ft³ | 374.03 US gal |
| 100 ft³ | 748.05 US gal |
| 500 ft³ | 3,740.26 US gal |
Formula
US gallons = cubic feet × 7.480519481FAQ
How many US gallons in a cubic feet?
1 ft³ = 7.48052 US gal. Multiply your cubic feet value by 7.48052.
Is this exact?
Yes — these factors derive from exact definitions: 1 US gallon = 231 cubic inches, 1 imperial gallon = 4.54609 liters, 1 inch = 2.54 cm, 1 barrel = 42 US gallons.
Why do tank specs mix cubic feet and US gallons?
US tank trade uses gallons and inches; engineering drawings and international suppliers use metric or cubic measures. This page bridges them without rounding drift.