Gallons to Cubic Meters (gal to m3) Converter
1 US gallon equals 0.00378541 cubic meters — multiply the number of gallons by 0.00378541 to convert to cubic meters. A cubic meter is a large SI volume unit, so gallons produce a small decimal. ByteTools applies the exact factor as you type.
The formula
To convert gallons to cubic meters, multiply by 0.00378541:
m³ = gal × 0.00378541
For example, 100 gallons × 0.00378541 = 0.378541 cubic meters. To reverse it, divide by 0.00378541 (or multiply cubic meters by 264.172052).
Conversion table
| Gallons (gal) | Cubic Meters (m³) |
|---|---|
| 1 | 0.00378541 |
| 2 | 0.00757082 |
| 5 | 0.01892706 |
| 10 | 0.03785412 |
| 25 | 0.09463529 |
| 50 | 0.18927059 |
| 100 | 0.37854118 |
| 500 | 1.89270589 |
| 1000 | 3.78541178 |
How to convert online
- Type the number of gallons into the first box.
- Read the cubic meters result instantly in the second box.
- Type a cubic meter value instead to convert back to gallons — it works both ways.
Use the Gallon to Cubic Meter Converter — free and instant in your browser.
Where this conversion is used
Gallons-to-cubic-meter conversions matter in water and wastewater management, tank and reservoir sizing, engineering and industrial process design. Bulk liquid volumes quoted in US gallons often have to be reported in cubic meters, the standard SI unit for large volumes.
FAQ
How many cubic meters are in a gallon?
One US gallon equals 0.00378541 cubic meters. So 100 gallons is about 0.379 m³ and 1,000 gallons is about 3.785 m³.
What is the formula to convert gallons to cubic meters?
Multiply gallons by 0.00378541: m³ = gal × 0.00378541. The converter applies this factor automatically.
How do I convert cubic meters back to gallons?
Divide by 0.00378541, or multiply cubic meters by 264.172052. For example, 1 m³ = 264.17 gallons.
How many gallons are in a cubic meter?
One cubic meter equals about 264.17 US gallons.
Related converters
- Cubic Meter to Gallon Converter
- Gallon to Liter Converter
- Gallon to Milliliter Converter
- Gallon to Cup Converter
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