US gallon to Cubic meter Converter
Type a value — the answer appears instantly. 1 gal = 0.00378541 m³.
Reviewed by the OmniCalc teamMethod verified 2026-07-01
0.00378541 cubic meters
= 3.78541 L= 3,785.41 ml
equals 0.00378541 cubic metersFormula: m³ = gal × 0.0037854118
US gallon to Cubic meter formula
m³ = gal × 0.0037854118
Convert 5 US gallons to cubic meters
- Start with 5 US gallons.
- Multiply by the conversion factor: 5 × 0.00378541 = 0.0189271.
- So 5 gal = 0.0189271 m³.
US gallon to Cubic meter conversion table
| US gallons (gal) | Cubic meters (m³) |
|---|---|
| 0.01 gal | 0.0000378541 m³ |
| 0.1 gal | 0.000378541 m³ |
| 0.25 gal | 0.000946353 m³ |
| 0.5 gal | 0.00189271 m³ |
| 1 gal | 0.00378541 m³ |
| 2 gal | 0.00757082 m³ |
| 3 gal | 0.0113562 m³ |
| 4 gal | 0.0151416 m³ |
| 5 gal | 0.0189271 m³ |
| 6 gal | 0.0227125 m³ |
| 7 gal | 0.0264979 m³ |
| 8 gal | 0.0302833 m³ |
| 9 gal | 0.0340687 m³ |
| 10 gal | 0.0378541 m³ |
| 15 gal | 0.0567812 m³ |
| 20 gal | 0.0757082 m³ |
| 25 gal | 0.0946353 m³ |
| 30 gal | 0.113562 m³ |
| 40 gal | 0.151416 m³ |
| 50 gal | 0.189271 m³ |
| 75 gal | 0.283906 m³ |
| 100 gal | 0.378541 m³ |
| 250 gal | 0.946353 m³ |
| 500 gal | 1.89271 m³ |
| 1,000 gal | 3.78541 m³ |
| 5,000 gal | 18.9271 m³ |
| 10,000 gal | 37.8541 m³ |
Unit definitions
What is a US gallon?
The US gallon is defined as exactly 231 cubic inches, or 3.785411784 litres. It is the standard unit for fuel, milk, and large liquid quantities in the United States. It is about 20% smaller than the imperial gallon.
What is a cubic meter?
The cubic metre is the SI derived unit of volume, equal to 1000 litres. It is used for water supply, gas, shipping cargo, and construction materials such as concrete. It is the volume of a cube one metre on each side.
Frequently asked questions
How many cubic meters are in one US gallon?
One US gallon equals 0.00378541 cubic meters (1 gal = 0.00378541 m³).
How do I convert US gallons to cubic meters?
Multiply the value in US gallons by 0.00378541. For example, 10 gal × 0.00378541 = 0.0378541 m³.
Which is bigger — a US gallon or a cubic meter?
A cubic meter is bigger: one cubic meter contains 264.172 US gallons.
Is this US gallon to cubic meter converter free?
Yes — the converter is free, works offline once loaded, and computes instantly in your browser without sending your numbers to a server.
Conversion factors follow international definitions (SI / NIST). Last verified 2026-07-01.