Volume units come up constantly in cooking, fuel, and liquid measurements, especially when switching between metric and US customary systems. This converter handles six common volume units using liters as the internal reference.
Conversion factors used
| Unit | Liters equivalent |
|---|---|
| 1 milliliter (mL) | 0.001 L |
| 1 cubic meter (m³) | 1,000 L |
| 1 US gallon (gal) | 3.78541 L |
| 1 US quart (qt) | 0.946353 L |
| 1 US fluid ounce (fl oz) | 0.0295735 L |
Note: this uses US customary gallons and fluid ounces. The UK imperial gallon (4.546 L) is a different, larger unit — double-check which system applies to your context if precision matters.
Worked examples
| From | To | Result |
|---|---|---|
| 1 US gallon | liters | 3.79 L |
| 500 mL | fl oz | 16.91 fl oz |
| 2 L | quarts | 2.11 qt |
Common mistakes
- Mixing up US and UK gallons. A US gallon (3.785 L) is smaller than a UK imperial gallon (4.546 L) — using the wrong one introduces a meaningful error.
References
- National Institute of Standards and Technology (NIST) — official unit definitions
Frequently asked questions
How many liters are in a US gallon?
One US gallon equals approximately 3.78541 liters.
Is a US gallon the same as a UK gallon?
No. A US gallon (3.785 L) is smaller than a UK imperial gallon (4.546 L) — always confirm which system applies to avoid a meaningful conversion error.
How do I convert milliliters to fluid ounces?
Divide the milliliter value by approximately 29.5735 to get US fluid ounces.