Fluid Ounces to Millilitres Converter
Convert US fluid ounces to millilitres — one US fluid ounce is 29.5735 mL. Results update as you type; exact factors shown.
One US fluid ounce is 29.5735 millilitres — see the exact factor, not a rounded rule of thumb.
How the fluid ounces to millilitres converter works
Volumes convert through the litre (exactly 1 dm³). The US gallon is exactly 3.785411784 L (231 cubic inches); the imperial gallon is exactly 4.54609 L. A US fluid ounce is 29.5735 mL, an imperial fluid ounce 28.4131 mL; a US pint is 16 US fl oz, an imperial pint 20 imperial fl oz.
The UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
Common volume conversions
| From | To | Units |
|---|---|---|
| 0.5 US fl oz | 14.7868 mL | US fluid ounces to millilitres |
| 1 US fl oz | 29.5735 mL | US fluid ounce to millilitres |
| 2 US fl oz | 59.1471 mL | US fluid ounces to millilitres |
| 4 US fl oz | 118.2941 mL | US fluid ounces to millilitres |
| 6 US fl oz | 177.4412 mL | US fluid ounces to millilitres |
| 8 US fl oz | 236.5882 mL | US fluid ounces to millilitres |
| 12 US fl oz | 354.8824 mL | US fluid ounces to millilitres |
| 16 US fl oz | 473.1765 mL | US fluid ounces to millilitres |
| 20 US fl oz | 591.4706 mL | US fluid ounces to millilitres |
| 24 US fl oz | 709.7647 mL | US fluid ounces to millilitres |
| 32 US fl oz | 946.3529 mL | US fluid ounces to millilitres |
| 64 US fl oz | 1,892.7059 mL | US fluid ounces to millilitres |
Units in this converter and their exact factors
| Unit | Symbol | One unit in litres |
|---|---|---|
| millilitre | mL | 0.001 litre |
| litre | L | 1 litre |
| cubic metre | m³ | 1,000 litre |
| teaspoon (metric) | tsp | 0.005 litre |
| tablespoon (metric) | tbsp | 0.015 litre |
| cup (metric) | cup | 0.25 litre |
| US fluid ounce | US fl oz | 0.0295735296 litre |
| US cup | US cup | 0.2365882365 litre |
| US pint | US pt | 0.473176473 litre |
| US gallon | US gal | 3.785411784 litre |
| imperial fluid ounce | imp fl oz | 0.0284130625 litre |
| imperial pint | imp pt | 0.56826125 litre |
| imperial gallon | imp gal | 4.54609 litre |
| cubic foot | ft³ | 28.316846592 litre |
FAQFrequently asked questions about volume conversion
How many millilitres in a fluid ounce?
29.5735 for a US fluid ounce; 28.4131 for an imperial one.
What is 8 fl oz?
237 mL — one US cup.
Why are the two ounces different?
The US fluid ounce is 1/128 of its gallon; the imperial one is 1/160 of a larger gallon.
What is a shot?
Typically 1.5 US fl oz, about 44 mL. Australian standard is 30 mL.
Is a fluid ounce a weight?
No, it is a volume. An ounce of weight is 28.35 g, which coincidentally is close but unrelated.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.