Milliliters to Ounces Converter
Convert milliliters to fluid ounces and back instantly.
Quick Reference: Milliliters to US Fluid Ounces
| Milliliters (mL) | US Fluid Ounces (fl oz) |
|---|---|
| 15 mL | 0.5072 fl oz |
| 30 mL | 1.0144 fl oz |
| 50 mL | 1.6907 fl oz |
| 100 mL | 3.3814 fl oz |
| 250 mL | 8.4535 fl oz |
| 500 mL | 16.9070 fl oz |
US vs UK Fluid Ounce
A fluid ounce is a unit of volume, but the two most common definitions are not the same size. The US fluid ounce equals exactly 29.5735295625 milliliters, while the UK (Imperial) fluid ounce equals exactly 28.4130625 milliliters. This means a US fluid ounce is about 4% larger than its Imperial counterpart. Always confirm which standard a recipe or label uses, especially when following British and American sources side by side.
- 1 US fl oz = 29.5735295625 mL
- 1 UK fl oz = 28.4130625 mL
The Conversion Factors
To convert milliliters to fluid ounces, divide the volume in milliliters by the relevant factor. To convert fluid ounces to milliliters, multiply instead:
- fl oz = mL ÷ factor
- mL = fl oz × factor
- US factor = 29.5735295625, UK factor = 28.4130625
Fluid Ounce vs Weight Ounce
A fluid ounce measures volume, while an ounce (oz) on a kitchen scale measures weight (mass). They are only numerically equal for water-like liquids at room temperature; for denser or lighter substances such as honey, oil, or flour the relationship changes. This converter handles fluid ounces only — never assume 1 fl oz of a substance weighs exactly 1 oz.
Common Uses
Milliliter-to-ounce conversions appear constantly in everyday life. In cooking and baking, recipes from different countries mix metric and imperial measurements, so converting between mL and fl oz keeps quantities accurate. For beverages, drink sizes, shots, and serving recommendations are often labeled in one system but consumed in another. The same applies to nutrition labels, medicine dosing cups, cosmetics, and travel-size toiletries, where small volumes are frequently listed in both units.