Gallons to Cubic Meters Converter
Convert US gallons to cubic meters — divide by 264.17. Results update as you type; exact factors shown.
One US gallon is 0.0038 cubic meters — see the exact factor, not a rounded rule of thumb.
How the gallons to cubic meters converter works
Volumes convert through the liter (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 US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
Common volume conversions
| From | To | Units |
|---|---|---|
| 10 US gal | 0.0379 m³ | US gallons to cubic meters |
| 50 US gal | 0.1893 m³ | US gallons to cubic meters |
| 100 US gal | 0.3785 m³ | US gallons to cubic meters |
| 264.172 US gal | 1 m³ | US gallons to cubic meters |
| 500 US gal | 1.8927 m³ | US gallons to cubic meters |
| 1,000 US gal | 3.7854 m³ | US gallons to cubic meters |
| 2,000 US gal | 7.5708 m³ | US gallons to cubic meters |
| 5,000 US gal | 18.9271 m³ | US gallons to cubic meters |
| 10,000 US gal | 37.8541 m³ | US gallons to cubic meters |
| 20,000 US gal | 75.7082 m³ | US gallons to cubic meters |
| 50,000 US gal | 189.2706 m³ | US gallons to cubic meters |
| 100,000 US gal | 378.5412 m³ | US gallons to cubic meters |
Units in this converter and their exact factors
| Unit | Symbol | One unit in liters |
|---|---|---|
| milliliter | mL | 0.001 liter |
| liter | L | 1 liter |
| cubic meter | m³ | 1,000 liter |
| teaspoon (metric) | tsp | 0.005 liter |
| tablespoon (metric) | tbsp | 0.015 liter |
| cup (metric) | cup | 0.25 liter |
| US fluid ounce | US fl oz | 0.0295735296 liter |
| US cup | US cup | 0.2365882365 liter |
| US pint | US pt | 0.473176473 liter |
| US gallon | US gal | 3.785411784 liter |
| imperial fluid ounce | imp fl oz | 0.0284130625 liter |
| imperial pint | imp pt | 0.56826125 liter |
| imperial gallon | imp gal | 4.54609 liter |
| cubic foot | ft³ | 28.316846592 liter |
FAQFrequently asked questions about volume conversion
How many gallons in a cubic meter?
264.172 US gallons.
What is 1,000 gallons in m³?
3.785 m³.
Why convert?
Because tanks and pipes are specified in cubic meters while water and fuel are billed in gallons.
What is an imperial gallon in m³?
0.00454609 m³.
What does a cubic meter 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 Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.