Convert US gallons to Cubic metres
1 US gallon is 0.003785 m³. One US gallon is exactly 0.003785411784 cubic metres.
One US gallon is 0.0037854118 cubic metres. To convert US gallons to cubic metres, multiply by 0.0037854118; to go the other way, divide by 0.0037854118 or multiply by 264.17205. 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 × 0.0037854118
1 * 0.00378540.004 m³
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 metres? The converter and the working
- 1.Take the measurement in US gallons.
- 2.Multiply by 0.0037854118 — that is how many cubic metres fit in one US gallon.
- 3.To go back the other way, divide by 0.0037854118, or multiply by 264.17205.
Worked example: 25 US gallons to cubic metres
- Formula
- gal × 0.0037854118 = m³
- Arithmetic
- 25 × 0.0037854118 = 0.09 m³
- Answer
- 25 gal = 0.09 m³
The factor is rounded for display; the figure above is computed from the full value.
US gallons to cubic metres conversion table
| US gallons | Cubic metres |
|---|---|
| 1 gal | 0.003785 m³ |
| 2 gal | 0.01 m³ |
| 3 gal | 0.01 m³ |
| 4 gal | 0.02 m³ |
| 5 gal | 0.02 m³ |
| 6 gal | 0.02 m³ |
| 7 gal | 0.03 m³ |
| 8 gal | 0.03 m³ |
| 9 gal | 0.03 m³ |
| 10 gal | 0.04 m³ |
| 12 gal | 0.05 m³ |
| 15 gal | 0.06 m³ |
| 20 gal | 0.08 m³ |
| 25 gal | 0.09 m³ |
| 50 gal | 0.19 m³ |
| 100 gal | 0.38 m³ |
| 200 gal | 0.76 m³ |
| 300 gal | 1.14 m³ |
| 500 gal | 1.89 m³ |
| 1000 gal | 3.79 m³ |
| 2000 gal | 7.57 m³ |
| 5000 gal | 18.93 m³ |
| 10000 gal | 37.85 m³ |
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 metre?
Exactly a thousand litres, by the definition of the litre. The SI unit of volume, and how the rest of the world orders concrete.
How many cubic metres are in a US gallon?
One US gallon is 0.0037854118 cubic metres. Going the other way, one cubic metre is 264.17205 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 metres. Rule Calculator. https://rulecalculators.com/convert/gallon-to-cubic-meter
- MLA
- "Convert US gallons to cubic metres." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/gallon-to-cubic-meter.
- Chicago
- Rule Calculator. "Convert US gallons to cubic metres." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/gallon-to-cubic-meter.
The date is when the figures on this page were last checked against their source, not the day you opened it. Add your own access date if your style needs one.
Questions people actually ask
- How many cubic metres are in a US gallon?
- 0.0037854118. Exactly a thousand litres, by the definition of the litre. The SI unit of volume, and how the rest of the world orders concrete.
- How do I convert cubic metres back to US gallons?
- Divide by 0.0037854118, or multiply by 264.17205 — they are the same operation.
Other volume conversions
Cubic metres to US gallons — the same conversion the other way.