Convert US gallons to cubic meters
Converting US gallons to cubic meters is a common volume task, whether you are checking a recipe, a spec sheet, a travel distance or a homework problem. Since 1 gal equals 0.00378541 m³, the math is a single multiplication — and this page does it for you instantly, with the formula, a table of common values and answers to the questions people ask most.
Exact factor
How to convert US gallons to cubic meters
To convert US gallons to cubic meters, multiply the number of US gallons by 0.00378541. For example, 10 gal × 0.00378541 = 0.0378541 m³.
m³ = gal × 0.00378541
- Write down the value in US gallons you want to convert.
- Multiply it by 0.00378541 (the exact gal→m³ factor).
- The result is your value in cubic meters. Check it below with the converter or the table.
Conversion table
Common values of US gallons and their equivalents in cubic meters:
| gal | m³ |
|---|---|
| 1 | 0.00378541 |
| 2 | 0.00757082 |
| 3 | 0.0113562 |
| 4 | 0.0151416 |
| 5 | 0.0189271 |
| 10 | 0.0378541 |
| 20 | 0.0757082 |
| 25 | 0.0946353 |
| 50 | 0.189271 |
| 100 | 0.378541 |
| 250 | 0.946353 |
| 500 | 1.89271 |
About these units
US Gallon (gal). The US liquid gallon is defined as exactly 3.785411784 liters, or 128 US fluid ounces. Fuel economy and milk containers in the United States use gallons.
Cubic Meter (m³). A cubic meter equals 1,000 liters, the SI unit of volume. Water meters, concrete orders, shipping containers and natural gas are measured in cubic meters.
Frequently asked questions
How do I convert US gallons to cubic meters?
To convert US gallons to cubic meters, multiply the number of US gallons by 0.00378541. For example, 10 gal × 0.00378541 = 0.0378541 m³. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many cubic meters are in 1 us gallon?
1 gal = 0.00378541 m³. That is the fixed relationship used by this converter and by international standards.
How many US gallons are in 1 cubic meter?
1 m³ = 264.172 gal. If you are converting in the opposite direction, use our Cubic Meter to US Gallon converter for the dedicated table and FAQ.
Is the US gallons to cubic meters conversion exact?
Yes. Both units are defined by international agreement, so the factor of 0.00378541 is exact. Displayed results are rounded to 6 significant digits only for readability.
What is us gallon used for?
The US liquid gallon is defined as exactly 3.785411784 liters, or 128 US fluid ounces. Fuel economy and milk containers in the United States use gallons.