A US fluid ounce is 1/128 of a US gallon.
Fluid ounces to Liters Converter — fl oz to L
Convert Fluid ounce (fl oz) to Liter (L) using the exact conversion factor (1 fluid ounce = 0.0295735296 liter). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Fluid ounces to Liters converter
Converter
Cooking Converter
Convert cooking volume and mass units used in recipes and nutrition workflows.
Context values
Some unit families need one extra value for a physically accurate result.
A liter is one cubic decimeter.
Result = input x 2.95735296e-5 / 0.001.
Volume units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Fluid ounces to Liters
Fluid ounce and Liter both show up in recipes, and converting between them matters whenever a recipe from one country's cookbook needs to be followed with another country's measuring tools. Fluid ounce is typically associated with united States (beverage, nutrition labeling), while Liter is typically associated with standard volume unit for liquids worldwide, including in the US for beverages and fuel labeling in some contexts.
Formula
liters = fluid ounces × 0.0295735295625
This factor comes from each unit's defined relationship to the category's base unit: 1 fluid ounce equals 0.0000295735295625 base units, and 1 liter equals 0.001 base units, so dividing one by the other gives the direct fluid ounce-to-liter factor of 0.0295735295625.
Simple example
1 fl oz × 0.02957352956 = 0.0295735296 L
1 fluid ounce = 0.0295735296 liters.
Real-world example
2 fl oz × 0.02957352956 = 0.0591470591 L
2 fluid ounces = 0.0591470591 liters.
Conversion table
| Fluid ounce (fl oz) | Liter (L) |
|---|---|
| 0.25 fl oz | 0.0073933824 L |
| 0.5 fl oz | 0.0147867648 L |
| 1 fl oz | 0.0295735296 L |
| 2 fl oz | 0.0591470591 L |
| 4 fl oz | 0.1182941182 L |
| 8 fl oz | 0.2365882365 L |
Reverse conversion: Liter to Fluid ounce
0.0295735296 L × 33.8140227 = 1.000000001 fl oz
0.0295735296 liters = 1.000000001 fluid ounces.
fluid ounces = liters × 33.8140227018
For a page dedicated to this direction, see Liter to Fluid ounce.
Fluid ounce vs. Liter
| Aspect | Fluid ounce | Liter |
|---|---|---|
| Family | US customary unit | Non-SI metric unit accepted for use with SI |
| Typical use | US beverage container sizing (soda, water bottles) | Beverage, fuel, and liquid product packaging worldwide |
| Where it's used | United States (beverage, nutrition labeling) | Standard volume unit for liquids worldwide, including in the US for beverages and fuel labeling in some contexts |
Understanding the Fluid ounce
Fluid ounce (fl oz) measures volume. The US fluid ounce is 1/128 of a US gallon: exactly 29.5735295625 milliliters. It is classified as a US customary unit.
Where it's used: United States (beverage, nutrition labeling)
Uses of the Fluid ounce today
- US beverage container sizing (soda, water bottles)
- US nutrition and medication dosing labels
History of the Fluid ounce
The US fluid ounce follows from the same English wine-gallon system as the rest of the US liquid volume units, defined as a consistent fraction of the gallon.
Historical origin. Fluid ounce was not the invention of a single named person; it developed through the process described above.
Understanding the Liter
Liter (L) measures volume. A liter is defined as exactly one cubic decimeter (0.001 cubic meters). It is classified as a Non-SI metric unit accepted for use with SI.
Where it's used: Standard volume unit for liquids worldwide, including in the US for beverages and fuel labeling in some contexts
Uses of the Liter today
- Beverage, fuel, and liquid product packaging worldwide
- Cooking and recipe measurement in metric countries
- Laboratory and scientific volume measurement
History of the Liter
The liter was introduced with the French metric system in 1795, originally defined as the volume of one kilogram of pure water at its freezing point — tying volume, mass, and the meter together.
Between 1901 and 1964, the liter was briefly redefined as the volume of exactly one kilogram of water at its maximum density (about 4 °C), which made it very slightly larger than a cubic decimeter. It was redefined back to exactly one cubic decimeter in 1964, the definition still used today.
Historical origin. Liter was not the invention of a single named person; it developed through the process described above.
Fluid ounce — sources
- NIST Handbook 44, Appendix C — General tables of units including the US fluid ounce definition.
Liter — sources
- BIPM SI Brochure — Non-SI units accepted for use with SI — Current cubic-decimeter definition of the liter.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many liters are in 1 fluid ounce?
1 fluid ounce equals 0.0295735296 liters, using the exact defined conversion factor rather than an estimate.
How do I convert fluid ounce to liter?
Multiply the fluid ounce value by 0.02957352956. The converter above does this instantly to whatever precision you set.
How do I convert liter back to fluid ounce?
Use the reverse factor: 1 liter equals 33.8140227 fluid ounces. You can also use the swap control in the converter above to flip the direction instantly.
What is a fluid ounce?
Fluid ounce (fl oz) measures volume. The US fluid ounce is 1/128 of a US gallon: exactly 29.5735295625 milliliters. It is classified as a US customary unit.
What is a liter?
Liter (L) measures volume. A liter is defined as exactly one cubic decimeter (0.001 cubic meters). It is classified as a Non-SI metric unit accepted for use with SI.
Is the fluid ounce to liter conversion exact?
Yes. A liter is defined as exactly one cubic decimeter (0.001 cubic meters). That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the fluid ounce still used today?
United States (beverage, nutrition labeling)