Convert US gallons to Cubic feet
1 US gallon is 0.13 ft³. One US gallon is exactly 0.133680555556 cubic feet.
One US gallon is 0.13368056 cubic feet. To convert US gallons to cubic feet, multiply by 0.13368056; to go the other way, divide by 0.13368056 or multiply by 7.4805195. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Handbook 130. Exactly 231 cubic inches.
Factor checked against the defining standard · How we check
- US gallons × 0.13368056
1 * 0.13368060.134 ft³
1 US gallon in every volume unit
| Unit | Value | Exact factor |
|---|---|---|
| US teaspoons | 768 tsp | × 768 |
| US tablespoons | 256 tbsp | × 256 |
| US fluid ounces | 128 fl oz | × 128 |
| US cups | 16 cup | × 16 |
| US pints | 8 pt | × 8 |
| US quarts | 4 qt | × 4 |
| US gallons (as entered) | 1 gal | — |
| milliliters | 3,785.411784 ml | × 3,785.411784 |
| liters | 3.785411784 L | × 3.785411784 |
| imperial gallons | 0.8326741846 gal (UK) | × 0.832674184629 |
| imperial quarts | 3.330696739 qt (UK) | × 3.33069673852 |
| imperial pints | 6.661393477 pt (UK) | × 6.66139347703 |
| imperial fluid ounces | 133.2278695 fl oz (UK) | × 133.227869541 |
| imperial gills | 26.64557391 gi (UK) | × 26.6455739081 |
| cubic millimetres | 3,785,411.784 mm³ | × 3,785,411.784 |
| cubic centimetres | 3,785.411784 cm³ | × 3,785.411784 |
| cubic inches | 231 in³ | × 231 |
| cubic feet | 0.1336805556 ft³ | × 0.133680555556 |
| cubic yards | 0.004951131687 yd³ | × 0.00495113168724 |
| cubic metres | 0.003785411784 m³ | × 0.003785411784 |
Factors are entered by hand from NIST Handbook 130 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert US gallons to cubic feet? The converter and the working
- 1.Take the measurement in US gallons.
- 2.Multiply by 0.13368056 — that is how many cubic feet fit in one US gallon.
- 3.To go back the other way, divide by 0.13368056, or multiply by 7.4805195.
Worked example: 25 US gallons to cubic feet
- Formula
- gal × 0.13368056 = ft³
- Arithmetic
- 25 × 0.13368056 = 3.34 ft³
- Answer
- 25 gal = 3.34 ft³
The factor is rounded for display; the figure above is computed from the full value.
US gallons to cubic feet conversion table
| US gallons | Cubic feet |
|---|---|
| 1 gal | 0.13 ft³ |
| 2 gal | 0.27 ft³ |
| 3 gal | 0.4 ft³ |
| 4 gal | 0.53 ft³ |
| 5 gal | 0.67 ft³ |
| 6 gal | 0.8 ft³ |
| 7 gal | 0.94 ft³ |
| 8 gal | 1.07 ft³ |
| 9 gal | 1.2 ft³ |
| 10 gal | 1.34 ft³ |
| 12 gal | 1.6 ft³ |
| 15 gal | 2.01 ft³ |
| 20 gal | 2.67 ft³ |
| 25 gal | 3.34 ft³ |
| 50 gal | 6.68 ft³ |
| 100 gal | 13.37 ft³ |
| 200 gal | 26.74 ft³ |
| 300 gal | 40.1 ft³ |
| 500 gal | 66.84 ft³ |
| 1000 gal | 133.68 ft³ |
| 2000 gal | 267.36 ft³ |
| 5000 gal | 668.4 ft³ |
| 10000 gal | 1,336.81 ft³ |
7.48 US gallons to the cubic foot, and 6.23 imperial ones
A cubic foot is 28.3168 litres, which is 7.4805 US gallons or 6.2288 imperial. Water billing, pool volumes and gas meters all cross this line: a US water meter reads in hundreds of cubic feet — one HCF is 748 gallons — and a bill quoted in gallons against a meter reading in CCF is out by a factor of 748 if the conversion is skipped.
NIST Handbook 44, Appendix C — general tables of units of measurement
What is a US gallon?
Exactly 231 cubic inches. The imperial gallon is 4.546 liters, so US and UK fuel economy figures are not comparable.
What is a cubic foot?
Exactly 28.316846592 litres, or 7.48 US gallons. The working unit of natural gas billing, air flow and refrigerator capacity in the US.
How many cubic feet are in a US gallon?
One US gallon is 0.13368056 cubic feet. Going the other way, one cubic foot is 7.4805195 US gallons. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every volume unit here
The whole group — 20 units with their symbols and the size of each one in liters — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a US gallon.
Cite this page
- APA
- Rule Calculator. (2026). Convert US gallons to cubic feet. Rule Calculator. https://rulecalculators.com/convert/gallon-to-cubic-foot
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- Chicago
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Questions people actually ask
- How many cubic feet are in a US gallon?
- 0.13368056. Exactly 28.316846592 litres, or 7.48 US gallons. The working unit of natural gas billing, air flow and refrigerator capacity in the US.
- How do I convert cubic feet back to US gallons?
- Divide by 0.13368056, or multiply by 7.4805195 — they are the same operation.
Other volume conversions
Cubic feet to US gallons — the same conversion the other way.