Volume
gal (US)toft³
Convert US gallons (gal (US)) to cubic feet (ft³).
Factor1 gal (US) = 0.1336806 ft³
Converter
gal (US)
Accepts numbers or expressions, e.g. 150 + 14.7
Result
ft³
Rendered to 6 significant figures.
Formula
Formula
ft³ = gal (US) × 0.1336806
Multiply any value in US gallons by 0.1336806 to obtain the value in cubic feet.
Worked example
Convert 100 gal (US) to ft³.
- 01Start with 100 gal (US).
- 02Multiply by the conversion factor: 100 × 0.1336806 = 13.3681 ft³.
Result100 gal (US) = 13.3681 ft³
Conversion table
| gal (US) | ft³ |
|---|---|
| 1 | 0.13368 |
| 2 | 0.26736 |
| 5 | 0.6684 |
| 10 | 1.3368 |
| 20 | 2.6736 |
| 50 | 6.684 |
| 100 | 13.368 |
| 200 | 26.736 |
| 500 | 66.84 |
| 1000 | 133.68 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from gal (US) to ft³?
1 gal (US) equals 0.1336806 ft³. To convert, multiply the value in US gallons by 0.1336806.
How do I convert 1 gal (US) to ft³?
1 gal (US) = 0.133681 ft³. For any value, multiply by 0.1336806.
How do I convert ft³ back to gal (US)?
Divide by the same factor — or equivalently, multiply by 7.480519. So 1 ft³ = 7.48052 gal (US).
When would I need to convert US gallon to cubic foot?
Volume conversions are used for tank sizing, batch calculations, and bridging between vendor specs (gallons, barrels, ft³) and process documentation (m³, litres).
Is the conversion exact?
Yes. Both gal (US) and ft³ are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).