How to convert US fluid ounces to millilitres
One US fluid ounce equals 29.5735 millilitres, so multiply the number of US fluid ounces by 29.5735:
ml = US fl oz × 29.5735
US fl oz = ml ÷ 29.5735 (1 ml = 0.033814 US fl oz)
Example: 3.4 US fl oz → 3.4 × 29.5735 = 100.55 ml.
Going the other way, divide by 29.5735, or multiply by 0.033814; the millilitres to US fluid ounces converter does it for you.
Everyday values
| US fluid ounces | Millilitres | For example |
|---|---|---|
| 1 US fl oz | 29.5735 ml | one fluid ounce |
| 3.4 US fl oz | 100.55 ml | a 100 ml travel bottle |
| 8 US fl oz | 236.588 ml | one US cup |
| 12 US fl oz | 354.882 ml | a US soda can |
| 16 US fl oz | 473.176 ml | a US pint |
| 20 US fl oz | 591.471 ml | a large bottle of soda |
When you need this conversion
A US fluid ounce (29.57 ml) is slightly larger than a UK fluid ounce (28.41 ml), and both are units of volume, not weight. Baby bottles, cocktail recipes and nutrition labels in the US use fluid ounces.
US fluid ounce to millilitre conversion table
| US fl oz | ml | US fl oz | ml |
|---|---|---|---|
| 1 US fl oz | 29.5735 ml | 17 US fl oz | 502.75 ml |
| 2 US fl oz | 59.1471 ml | 18 US fl oz | 532.324 ml |
| 3 US fl oz | 88.7206 ml | 19 US fl oz | 561.897 ml |
| 4 US fl oz | 118.294 ml | 20 US fl oz | 591.471 ml |
| 5 US fl oz | 147.868 ml | 21 US fl oz | 621.044 ml |
| 6 US fl oz | 177.441 ml | 22 US fl oz | 650.618 ml |
| 7 US fl oz | 207.015 ml | 23 US fl oz | 680.191 ml |
| 8 US fl oz | 236.588 ml | 24 US fl oz | 709.765 ml |
| 9 US fl oz | 266.162 ml | 25 US fl oz | 739.338 ml |
| 10 US fl oz | 295.735 ml | 26 US fl oz | 768.912 ml |
| 11 US fl oz | 325.309 ml | 27 US fl oz | 798.485 ml |
| 12 US fl oz | 354.882 ml | 28 US fl oz | 828.059 ml |
| 13 US fl oz | 384.456 ml | 29 US fl oz | 857.632 ml |
| 14 US fl oz | 414.029 ml | 30 US fl oz | 887.206 ml |
| 15 US fl oz | 443.603 ml | 31 US fl oz | 916.779 ml |
| 16 US fl oz | 473.176 ml | 32 US fl oz | 946.353 ml |
About the units
- US fluid ounce (US fl oz): 1/128 of a US gallon, about 29.57 millilitres.
- Millilitre (ml): one thousandth of a litre, the same as one cubic centimetre.
Both are units of volume. The conversion factor comes from the exact definitions above, so the calculator is exact; results are only rounded for display (up to six significant digits).
Frequently asked questions
How many millilitres are in one US fluid ounce?
One US fluid ounce is 29.5735 millilitres. One millilitre is 0.033814 US fluid ounces.
How do I convert US fluid ounces to millilitres?
Multiply the value in US fluid ounces by 29.5735. To go back, divide by 29.5735.
What is 3.4 US fl oz in millilitres?
3.4 US fl oz = 100.55 ml.
What is 8 US fl oz in millilitres?
8 US fl oz = 236.588 ml.
Sources
- NIST Special Publication 811 (2008), Guide for the Use of the International System of Units (SI), Appendix B: conversion factors.
- NIST Handbook 44 (2024), Appendix C: General tables of units of measurement.
Last reviewed 5 October 2026. Results are estimates; see our disclaimer.