Fluid Ounces to ML Converter
Convert US fluid ounces to milliliters — 29.57 ml to the fluid ounce. Results update as you type; exact factors shown.
One US fluid ounce is 29.5735 milliliters — see the exact factor, not a rounded rule of thumb.
How the fluid ounces to ml converter works
Volumes convert through the liter (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 US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
Common volume conversions
| From | To | Units |
|---|---|---|
| 0.5 US fl oz | 14.7868 mL | US fluid ounces to milliliters |
| 1 US fl oz | 29.5735 mL | US fluid ounce to milliliters |
| 2 US fl oz | 59.1471 mL | US fluid ounces to milliliters |
| 4 US fl oz | 118.2941 mL | US fluid ounces to milliliters |
| 6 US fl oz | 177.4412 mL | US fluid ounces to milliliters |
| 8 US fl oz | 236.5882 mL | US fluid ounces to milliliters |
| 12 US fl oz | 354.8824 mL | US fluid ounces to milliliters |
| 16 US fl oz | 473.1765 mL | US fluid ounces to milliliters |
| 20 US fl oz | 591.4706 mL | US fluid ounces to milliliters |
| 24 US fl oz | 709.7647 mL | US fluid ounces to milliliters |
| 32 US fl oz | 946.3529 mL | US fluid ounces to milliliters |
| 64 US fl oz | 1,892.7059 mL | US fluid ounces to milliliters |
Units in this converter and their exact factors
| Unit | Symbol | One unit in liters |
|---|---|---|
| milliliter | mL | 0.001 liter |
| liter | L | 1 liter |
| cubic meter | m³ | 1,000 liter |
| teaspoon (metric) | tsp | 0.005 liter |
| tablespoon (metric) | tbsp | 0.015 liter |
| cup (metric) | cup | 0.25 liter |
| US fluid ounce | US fl oz | 0.0295735296 liter |
| US cup | US cup | 0.2365882365 liter |
| US pint | US pt | 0.473176473 liter |
| US gallon | US gal | 3.785411784 liter |
| imperial fluid ounce | imp fl oz | 0.0284130625 liter |
| imperial pint | imp pt | 0.56826125 liter |
| imperial gallon | imp gal | 4.54609 liter |
| cubic foot | ft³ | 28.316846592 liter |
FAQFrequently asked questions about volume conversion
How many ml in a US fluid ounce?
29.5735.
Is the UK fluid ounce the same?
No — the imperial one is 28.413 ml.
How many fluid ounces in a US cup?
Eight, so 236.6 ml.
Is a fluid ounce a weight?
No, a volume. Only for water are the two roughly equal.
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 Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.