How to Convert US fluid ounces to Litres (fl oz to L)
Volume conversions help with baking from American recipes, comparing petrol prices quoted per gallon abroad with pump prices per litre here, and reading PUB water bills in cubic metres. This guide shows how to convert us fluid ounces into litres by hand, with examples and a quick-reference table.
The conversion
To convert us fluid ounces to litres, multiply the value by 0.0295735. To go the other way, divide by the same number (or multiply by 33.8140565033). For a quick estimate, multiply by about 0.03.
Litres = us fluid ounces × 0.0295735
Worked examples
- 3 fl oz = 0.08872 L
- 12.5 fl oz = 0.369669 L
- 75 fl oz = 2.218 L
US fluid ounces to Litres table
| US fluid ounces | Litres |
|---|---|
| 1 fl oz | 0.029573 L |
| 2 fl oz | 0.059147 L |
| 5 fl oz | 0.147867 L |
| 10 fl oz | 0.295735 L |
| 20 fl oz | 0.59147 L |
| 25 fl oz | 0.739337 L |
| 50 fl oz | 1.4787 L |
| 100 fl oz | 2.9573 L |
| 250 fl oz | 7.3934 L |
| 500 fl oz | 14.7867 L |
| 1,000 fl oz | 29.5735 L |
Common questions
Is fl oz to L exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Litres to US fluid ounces converter.
Mistakes to avoid
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Background
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
For everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
For any value, use the US fluid ounces to Litres Converter or browse all volume converters.
Run your own numbers: US fluid ounces to Litres Converter