To convert us gallons to cubic feet, multiply by 0.1336805556.
The calculation uses 1 gal = 0.1336805556 ft³. Results are displayed to at most 10 significant digits. Definitions can be exact while a displayed decimal is rounded. Match the displayed precision to your original measurement.
The formula
value in ft³ = value in gal × 0.1336805556
gal- Input unit: us gallons
ft³- Output unit: cubic feet
How to use this calculator
- Enter a value in gal.
- Multiply by the stored conversion factor.
- Read the result in ft³; divide by the same factor to convert back.
Worked examples
Worked conversion
1 gal × 0.1336805556 ≈ 0.1336805556 ft³.
Reverse conversion
0.1336805556 ft³ ÷ 0.1336805556 ≈ 1 gal. Rounding intermediate values can change the last displayed digit.
Frequently asked questions
What factor does this converter use?
It uses 0.1336805556 ft³ per gal.
Why can another converter show a slightly different answer?
Check the unit convention first (such as US versus Imperial or decimal versus binary), then compare rounding. Measurement uncertainty is separate from the unit conversion.
gal to ft³ table
| gal | ft³ (rounded) |
|---|---|
| 0 | 0 |
| 1 | 0.1336805556 |
| 2 | 0.2673611111 |
| 5 | 0.6684027778 |
| 10 | 1.336805556 |
| 100 | 13.36805556 |
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