Gallons to Cubic Metres Converter
Convert US gallons to cubic metres — divide by 264.17. Results update as you type; exact factors shown.
One US gallon is 0.0038 cubic metres — see the exact factor, not a rounded rule of thumb.
How the gallons to cubic metres converter works
Volumes convert through the litre (exactly 1 dm³). The US gallon is exactly 3.785411784 L (231 cubic inches); the imperial gallon is exactly 4.54609 L. A US fluid ounce is 29.5735 mL, an imperial fluid ounce 28.4131 mL; a US pint is 16 US fl oz, an imperial pint 20 imperial fl oz.
The UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
Common volume conversions
| From | To | Units |
|---|---|---|
| 10 US gal | 0.0379 m³ | US gallons to cubic metres |
| 50 US gal | 0.1893 m³ | US gallons to cubic metres |
| 100 US gal | 0.3785 m³ | US gallons to cubic metres |
| 264.172 US gal | 1 m³ | US gallons to cubic metres |
| 500 US gal | 1.8927 m³ | US gallons to cubic metres |
| 1,000 US gal | 3.7854 m³ | US gallons to cubic metres |
| 2,000 US gal | 7.5708 m³ | US gallons to cubic metres |
| 5,000 US gal | 18.9271 m³ | US gallons to cubic metres |
| 10,000 US gal | 37.8541 m³ | US gallons to cubic metres |
| 20,000 US gal | 75.7082 m³ | US gallons to cubic metres |
| 50,000 US gal | 189.2706 m³ | US gallons to cubic metres |
| 100,000 US gal | 378.5412 m³ | US gallons to cubic metres |
Units in this converter and their exact factors
| Unit | Symbol | One unit in litres |
|---|---|---|
| millilitre | mL | 0.001 litre |
| litre | L | 1 litre |
| cubic metre | m³ | 1,000 litre |
| teaspoon (metric) | tsp | 0.005 litre |
| tablespoon (metric) | tbsp | 0.015 litre |
| cup (metric) | cup | 0.25 litre |
| US fluid ounce | US fl oz | 0.0295735296 litre |
| US cup | US cup | 0.2365882365 litre |
| US pint | US pt | 0.473176473 litre |
| US gallon | US gal | 3.785411784 litre |
| imperial fluid ounce | imp fl oz | 0.0284130625 litre |
| imperial pint | imp pt | 0.56826125 litre |
| imperial gallon | imp gal | 4.54609 litre |
| cubic foot | ft³ | 28.316846592 litre |
FAQFrequently asked questions about volume conversion
How many gallons in a cubic metre?
264.172 US gallons.
What is 1,000 gallons in m³?
3.785 m³.
Why convert?
Because tanks and pipes are specified in cubic metres while water and fuel are billed in gallons.
What is an imperial gallon in m³?
0.00454609 m³.
What does a cubic metre of water weigh?
One tonne.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.