Millilitres to US Fluid Ounces Converter
Convert millilitres to US fluid ounces by volume. This is useful for comparing bottle capacities and drink volumes.
Enter a zero or positive amount. Decimal values are supported. Only the displayed result is rounded.
Reference: NIST Guide to the SI, Appendix B.9 (volume conversion factors). The displayed result is rounded; it is a unit conversion, not a measurement of water need.
Formula
US fl oz = mL ÷ 29.5735295625
Example: 500 mL is about 16.907 US fl oz.
About these units
A US fluid ounce measures volume. An ounce by weight measures mass; the two are different units and cannot be substituted without knowing the material’s density.
Everyday conversion examples
This volume conversion is handy for comparing metric bottle sizes with US beverage measurements. Enter the measured millilitres and read the equivalent US fluid ounces.
| Millilitres | US fluid ounces |
|---|---|
| 250 | 8.454 |
| 330 | 11.159 |
| 500 | 16.907 |
| 1,000 | 33.814 |
Examples are rounded for readability. Use the calculator above for another amount; it keeps the conversion factor until the final display.
Is a fluid ounce the same as an ounce by weight?
No. A US fluid ounce measures volume; an ounce by weight measures mass. They are not interchangeable without density information.
Why can a bottle label show a slightly different number?
Labels may round to a convenient value, and other references may use fewer digits in the conversion factor. The tool rounds only its displayed answer.
Source
Conversion factors are based on customary and metric volume relationships documented by the National Institute of Standards and Technology (NIST), Guide to the SI, Appendix B.9. NIST reports rounded factors; this page displays a rounded result.