1 fluid ounce = 29.57 milliliters
Convert fluid ounces to milliliters with an exact, internationally defined factor — 1 fl oz = 29.5735295625 ml (exact).
fluid ounces to milliliters
Computed with the exact factor · NIST SP 811
| Fluid ounce | Milliliter |
|---|---|
| 0.5 fl oz | 14.79 ml |
| 1 fl oz | 29.57 ml |
| 2 fl oz | 59.15 ml |
| 3 fl oz | 88.72 ml |
| 5 fl oz | 147.87 ml |
| 10 fl oz | 295.74 ml |
| 25 fl oz | 739.34 ml |
| 50 fl oz | 1,478.68 ml |
| 100 fl oz | 2,957.35 ml |
Exact factor details
- Exact factor
- 1 fl oz = 29.57 ml (exact definition)
- Significant digits
- up to 4 significant digits shown
- Data source
- NIST SP 811 — verified against official tables
Why fl oz to ml trips people up
Volume conversions for cooking and everyday measuring — milliliters, liters, US cups, tablespoons, teaspoons, fluid ounces, and gallons. The US liquid gallon is defined as exactly 3.785411784 liters. A US fluid ounce is about 29.57 ml — different from the imperial fluid ounce (28.41 ml). A milliliter is one-thousandth of a liter and, for water, one gram.
US customary volumes descend from English wine measures: 1 gallon is 4 quarts, 1 quart is 2 pints, 1 pint is 2 cups, and 1 cup is 16 tablespoons (or 48 teaspoons). The US cup of 236.5882365 ml differs from the metric cup (250 ml) used in Australia and much of Europe — check which one a recipe means before scaling. For water-like liquids, milliliters and grams are nearly interchangeable.
Use the quick-reference table for the amounts people actually look up, and the converter above for everything in between. Both are computed from the same factor at full precision, so the table and the converter can never disagree — there is no second, rounded copy of the data anywhere on this page.
Frequently asked questions
Is the fl oz to ml conversion exact?
Yes. 1 fl oz = 29.5735295625 ml (exact) and 1 ml = 0.001 l (exact) are exact definitions, so the conversion is exact — results are rounded only for readability.
How do I convert fl oz to ml in my head?
For rough work, treat 1 cup as 240 ml, 1 tablespoon as 15 ml, and 1 gallon as 3.8 liters.
Why do other sites show slightly different fl oz to ml results?
They round at different steps. This page computes with the full-precision factor and rounds only the final displayed number, so small trailing digits can differ from sites that round earlier.