Conversion
Us Gallons to cubic feet
1 US gal = 0.133681 ft³, derived from exact unit definitions.
—
Swap ⇆| US gal | ft³ |
|---|---|
| 1 US gal | 0.134 ft³ |
| 5 US gal | 0.668 ft³ |
| 10 US gal | 1.337 ft³ |
| 50 US gal | 6.684 ft³ |
| 100 US gal | 13.368 ft³ |
| 275 US gal | 36.762 ft³ |
| 500 US gal | 66.840 ft³ |
| 1,000 US gal | 133.681 ft³ |
Formula
cubic feet = US gallons × 0.1336805556FAQ
How many cubic feet in a US gallon?
1 US gal = 0.133681 ft³. Multiply your US gallons value by 0.133681.
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 US gallons and cubic feet?
US tank trade uses gallons and inches; engineering drawings and international suppliers use metric or cubic measures. This page bridges them without rounding drift.