Milliliters to Fluid Ounces
Convert milliliters to fluid ounces instantly. Free, fast, no signup.
How to use this tool
- Enter milliliters in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your fluid ounces and the full breakdown beneath it.
Convert milliliters to fluid ounces instantly. Free, fast, no signup.
Formula
Fluid Ounces (US) = Milliliters × 0.033814022701843
Equivalently: 1 US fluid ounce = 29.5735295625 mL, so dividing milliliters by 29.5735295625 gives the same result.
How it works
Multiply the milliliter value by approximately 0.033814 to get US fluid ounces. The conversion factor is the reciprocal of the exact definition: 1 US fluid ounce equals 29.5735295625 milliliters, itself derived from the US gallon definition.
Common mistake: Confusing fluid ounces (a measure of volume) with avoirdupois ounces (a measure of mass/weight). A fluid ounce of water weighs approximately 1.04 avoirdupois ounces — close, but not equal, and the difference grows for liquids denser or lighter than water.
Worked example
Convert 100 milliliters to fluid ounces
- Start with 100 mL.
- Multiply by 0.033814022701843: 100 × 0.033814022701843 = 3.3814022701843.
- Round to four decimal places: 3.3814.
100 mL = 3.3814 fluid ounces
Common mistakes to avoid
- Confusing US fluid ounces (29.5735 mL) with UK fluid ounces (28.4131 mL) -- using the US factor for a UK recipe understates the fluid ounce result by about 4%.
- Confusing fluid ounces with weight ounces -- 30 mL of water weighs approximately 30 g = 1.06 oz by weight, but equals 1.014 fl oz by volume; the two are not interchangeable for dense liquids.
- Using 30 mL per fl oz as a shortcut instead of 29.5735, overstating the ounce count slightly across larger volumes.
Key terms
- Milliliter (mL)
- One-thousandth of a liter; a unit of volume in the metric system commonly used for liquids in medicine, cooking, and science.
- US fluid ounce
- A unit of volume equal to 1/128 of a US gallon, or exactly 29.5735295625 mL. Not to be confused with the imperial fluid ounce (≈ 28.413 mL).
- Avoirdupois ounce
- A unit of mass equal to 1/16 of a pound (≈ 28.35 g). Unrelated to fluid ounces despite sharing a name.
- Imperial fluid ounce
- The UK fluid ounce, equal to approximately 28.413 mL — slightly smaller than the US fluid ounce of 29.574 mL.
Frequently asked questions
- How do I convert milliliters to fluid ounces?
- Multiply the number of milliliters by 0.033814 to get fluid ounces.