How to Convert US fluid ounces to Millilitres (fl oz to ml)
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 millilitres by hand, with examples and a quick-reference table.
The conversion
To convert us fluid ounces to millilitres, multiply the value by 29.5735. To go the other way, divide by the same number (or multiply by 0.0338140565). For a quick estimate, multiply by about 30.
Millilitres = us fluid ounces × 29.5735
Worked examples
- 3 fl oz = 88.7205 ml
- 12.5 fl oz = 369.6687 ml
- 75 fl oz = 2,218.01 ml
US fluid ounces to Millilitres table
| US fluid ounces | Millilitres |
|---|---|
| 1 fl oz | 29.5735 ml |
| 2 fl oz | 59.147 ml |
| 5 fl oz | 147.8675 ml |
| 10 fl oz | 295.735 ml |
| 20 fl oz | 591.47 ml |
| 25 fl oz | 739.3375 ml |
| 50 fl oz | 1,478.67 ml |
| 100 fl oz | 2,957.35 ml |
| 250 fl oz | 7,393.38 ml |
| 500 fl oz | 14,786.75 ml |
| 1,000 fl oz | 29,573.5 ml |
Common questions
Is fl oz to ml 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 Millilitres to US fluid ounces converter.
Mistakes to avoid
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
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.
Background
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.
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
For any value, use the US fluid ounces to Millilitres Converter or browse all volume converters.
Run your own numbers: US fluid ounces to Millilitres Converter