Imperial fluid ounce (fl oz (Imp))
1 Imperial fluid ounce = 0.02841306 litres
What is Imperial fluid ounce?
An Imperial fluid ounce is a volume unit used in the United Kingdom equal to approximately 28.41 millilitres. It is used in British cooking recipes, beverage servings, and pharmaceutical labelling.
Notes: Imperial unit
Real-world uses
Imperial fluid ounces are used in the United Kingdom, Canada (in some contexts), and other Commonwealth countries for beverage serving sizes and recipe measurements. A British pint is 20 Imperial fluid ounces, compared to the US pint of 16 US fluid ounces.
History
The Imperial fluid ounce was defined by the British Weights and Measures Act of 1824, which established the Imperial gallon based on the volume of 10 pounds of water at 62°F. One Imperial fluid ounce is 1/160 of that gallon.
Common mistakes
Assuming Imperial and US fluid ounces are the same. An Imperial fluid ounce is about 28.41 mL versus 29.57 mL for the US version. This means an Imperial pint (568 mL) is larger than a US pint (473 mL).
When is this conversion used?
Converting between Imperial 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 Imperial fluid ounce to litre
To convert Imperial fluid ounce to litre, multiply the value by 0.02841306.
Conversion formula (from base unit)
x * 0.0284130625
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.
| Imperial fluid ounces | litres |
|---|---|
| 0.1 | 0.00284131 |
| 0.5 | 0.01420653 |
| 1 | 0.02841306 |
| 2 | 0.05682612 |
| 5 | 0.14206531 |
| 10 | 0.28413062 |
| 25 | 0.71032656 |
| 50 | 1.42065312 |
| 100 | 2.84130625 |
| 250 | 7.10326562 |
| 500 | 14.20653125 |
| 1,000 | 28.4130625 |
Common values
| Imperial fluid ounces | litres | |
|---|---|---|
| A teaspoon | 0.1759754 Imperial fluid ounces | 0.005 litres |
| A cup of coffee | 8.79876993 Imperial fluid ounces | 0.25 litres |
| A water bottle | 17.59753986 Imperial fluid ounces | 0.5 litres |
| A bathtub | 10,558.52391836 Imperial fluid ounces | 300 litres |
| A swimming pool (Olympic) | 87,987,699.31963512 Imperial fluid ounces | 2,500,000 litres |
Full Imperial fluid ounce conversion table
| Unit | Value | Factor |
|---|---|---|
| litre | 1 fl oz (Imp) = 0.02841306 L | × 0.02841306 |
| millilitre | 1 fl oz (Imp) = 28.4130625 mL | × 28.4130625 |
| US gallon | 1 fl oz (Imp) = 0.00750594 gal (US) | × 0.00750594 |
| cubic metre | 1 fl oz (Imp) = 0.00002841 m³ | × 0.00002841 |
| Imperial gallon | 1 fl oz (Imp) = 0.00625 gal (Imp) | × 0.00625 |
| US fluid ounce | 1 fl oz (Imp) = 0.96075994 fl oz (US) | × 0.96075994 |
| teaspoon (metric) | 1 fl oz (Imp) = 5.6826125 tsp | × 5.6826125 |
| tablespoon (metric) | 1 fl oz (Imp) = 1.89420417 Tbsp | × 1.89420417 |
| cubic centimetre | 1 fl oz (Imp) = 28.4130625 cm³ | × 28.4130625 |