US fluid ounce (fl oz (US))
1 US fluid ounce = 0.02957353 litres
What is US fluid ounce?
A US fluid ounce is a volume unit equal to approximately 29.57 millilitres. It is used in the United States for beverage servings, cooking measurements, and product labelling.
Notes: USCS unit
Real-world uses
US fluid ounces are used for beverage labelling (a standard can of soda is 12 fl oz), cooking measurements, and cosmetics packaging in the United States. Cocktail recipes and bartending rely heavily on fluid ounce measurements (a standard shot is 1.5 fl oz).
History
The US fluid ounce derives from the English wine gallon tradition. When the US and UK diverged in measurement standards in the 19th century, their fluid ounces ended up slightly different. The US fluid ounce is defined as 1/128 of a US gallon.
Common mistakes
Confusing US fluid ounces with Imperial fluid ounces—they differ by about 4% (US: 29.57 mL, Imperial: 28.41 mL). Also, confusing fluid ounces (volume) with avoirdupois ounces (weight), which are completely different measurements.
When is this conversion used?
Converting between US fluid ounce and litre is common when working across metric and imperial systems, such as international trade, travel between countries with different measurement standards, or following instructions from a different region. Fuel economy, beverage volumes, and liquid measurements frequently require converting between litres and US gallons, especially for automotive and cooking contexts across different markets.
How to convert US fluid ounce to litre
To convert US fluid ounce to litre, multiply the value by 0.02957353.
Conversion formula (from base unit)
x * 0.0295735295625
Measurement standards
The cubic metre is the SI derived unit of volume. The litre, equal to exactly one cubic decimetre (0.001 m³), is accepted by the BIPM for use alongside SI units. Both the lowercase "l" and uppercase "L" are approved symbols for the litre.
Did you know?
An Olympic swimming pool holds 2,500 cubic metres of water — about 2.5 million litres. The Amazon River discharges roughly 209,000 cubic metres per second, enough to fill 84 Olympic pools every single second.
| US fluid ounces | litres |
|---|---|
| 0.1 | 0.00295735 |
| 0.5 | 0.01478676 |
| 1 | 0.02957353 |
| 2 | 0.05914706 |
| 5 | 0.14786765 |
| 10 | 0.2957353 |
| 25 | 0.73933824 |
| 50 | 1.47867648 |
| 100 | 2.95735296 |
| 250 | 7.39338239 |
| 500 | 14.78676478 |
| 1,000 | 29.57352956 |
Common values
| US fluid ounces | litres | |
|---|---|---|
| A teaspoon | 0.16907011 US fluid ounces | 0.005 litres |
| A cup of coffee | 8.45350568 US fluid ounces | 0.25 litres |
| A water bottle | 16.90701135 US fluid ounces | 0.5 litres |
| A bathtub | 10,144.20681055 US fluid ounces | 300 litres |
| A swimming pool (Olympic) | 84,535,056.7546075 US fluid ounces | 2,500,000 litres |
Full US fluid ounce conversion table
| Unit | Value | Factor |
|---|---|---|
| litre | 1 fl oz (US) = 0.02957353 L | × 0.02957353 |
| millilitre | 1 fl oz (US) = 29.57352956 mL | × 29.57352956 |
| US gallon | 1 fl oz (US) = 0.0078125 gal (US) | × 0.0078125 |
| cubic metre | 1 fl oz (US) = 0.00002957 m³ | × 0.00002957 |
| Imperial gallon | 1 fl oz (US) = 0.00650527 gal (Imp) | × 0.00650527 |
| Imperial fluid ounce | 1 fl oz (US) = 1.04084273 fl oz (Imp) | × 1.04084273 |
| teaspoon (metric) | 1 fl oz (US) = 5.91470591 tsp | × 5.91470591 |
| tablespoon (metric) | 1 fl oz (US) = 1.97156864 Tbsp | × 1.97156864 |
| cubic centimetre | 1 fl oz (US) = 29.57352956 cm³ | × 29.57352956 |