US Fluid Ounces to Millilitres Converter
Convert US fluid ounces to millilitres for beverage and water-volume measurements. The input is a US fluid ounce, not an ounce by weight.
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
mL = US fl oz × 29.5735295625
Example: 16 US fl oz is about 473.176 mL.
About these units
This page converts volume to volume. Ounces used for weight measure mass and need separate information (such as density) for any volume comparison.
Everyday conversion examples
Use US fluid ounces when the quantity describes liquid volume in US units. This converter is useful for translating a drink size or container amount into millilitres.
| US fluid ounces | Millilitres |
|---|---|
| 8 | 236.588 |
| 12 | 354.882 |
| 16 | 473.176 |
| 20 | 591.471 |
Examples are rounded for readability. Use the calculator above for another amount; it keeps the conversion factor until the final display.
How many millilitres are in a US fluid ounce?
One US fluid ounce is about 29.57353 mL.
Can I use this for ounces listed by weight?
No. Weight ounces measure mass, while fluid ounces measure volume. Use a mass conversion only when the material and required units are clear.
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.