Fluid Ounces to Milliliters
Type a value in either box to convert between fluid ounces and milliliters. The factor is 29.5735.
| Fluid Ounces | Milliliters |
|---|---|
| 1 fl oz | 29.57353 mL |
| 2 fl oz | 59.147059 mL |
| 3 fl oz | 88.720589 mL |
| 5 fl oz | 147.867648 mL |
| 10 fl oz | 295.735296 mL |
| 25 fl oz | 739.338239 mL |
| 50 fl oz | 1478.676478 mL |
| 100 fl oz | 2957.352956 mL |
How to use
- Enter a value in the Fluid Ounces field.
- The Milliliters figure appears immediately — no button to press.
- Typing in the Milliliters field converts back to Fluid Ounces the same way.
- Use the reference table for the values that come up most often.
Fluid Ounces to Milliliters formula
The factor from fluid ounces to milliliters is 29.5735296.
mL = fl oz × 29.5735296
Why this factor: the fluid ounce and the milliliter are both defined against the liter, so dividing one definition by the other gives 29.5735296 directly. Both definitions are set out in full below.
To go the other way, divide by 29.5735296 — or use the Milliliters to Fluid Ounces converter, which is the same calculation reversed.
Worked example
Given 50 fl oz, multiplying by 29.5735296 yields 1478.676478 mL.
50 fl oz × 29.5735296 = 1478.676478 mL
The converter above does this for any value you type, in either direction.
What is a fluid ounce?
A US fluid ounce is a small liquid volume, one eighth of a cup.
Definition: Exactly one 128th of a US liquid gallon, so exactly 29.5735295625 milliliters.
Where it is used: Beverage cans and bottles, cosmetics, and small liquid quantities in the US.
Worth knowing: Measures volume, not weight — a fluid ounce of water weighs about 1.04 avoirdupois ounces. The imperial fluid ounce is 28.41 mL.
What is a milliliter?
A milliliter is one thousandth of a liter, and is exactly the same volume as a cubic centimeter.
Definition: Exactly 0.001 liter, which is exactly 1 cm³.
Where it is used: Medicine doses, cosmetics, recipe quantities, and laboratory work.
Worth knowing: 1 mL = 1 cm³ = 1 cc exactly, so these three units are interchangeable.
Fluid Ounces vs Milliliters
The fluid ounce is a US customary unit while the milliliter is a metric unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many milliliters are in a fluid ounce?
One fluid ounce equals 29.5735296 milliliters.
What is the formula to convert fluid ounces to milliliters?
Multiply the number of fluid ounces by 29.5735296. To reverse it, divide by 29.5735296 instead.
How do I convert milliliters back to fluid ounces?
Divide by 29.5735296, which is the same as multiplying by 0.0338140227.
How many milliliters are in 10 fluid ounces?
10 fl oz works out to 295.735296 mL.
Is there anything to watch out for with fluid ounces?
Measures volume, not weight — a fluid ounce of water weighs about 1.04 avoirdupois ounces. The imperial fluid ounce is 28.41 mL.
How is the fluid ounce defined?
Exactly one 128th of a US liquid gallon, so exactly 29.5735295625 milliliters.