Small glass
Input: 100 mL
Output: 3.3814 fl oz
100 ÷ 29.5735295625 = 3.3814 US fluid ounces.
mL to fluid ounces converter
Use this for recipes and drink sizes given in milliliters when you need US fluid ounces.
Fluid ounces (US):
Formula and algorithm
- fluid ounces (US) = milliliters ÷ 29.5735295625
- Constant used: 1 US fluid ounce = 29.5735295625 milliliters (exact).
- UK (imperial) fluid ounces are different (28.4130625 mL) — this tool uses US fluid ounces.
Worked examples
Cup of liquid
Input: 250 mL
Output: 8.4535 fl oz
250 ÷ 29.5735295625 = 8.4535 US fluid ounces.
Half liter
Input: 500 mL
Output: 16.907 fl oz
500 ÷ 29.5735295625 = 16.907 US fluid ounces.
FAQ
Is this US or UK fluid ounces?
US fluid ounces (29.5735 mL). UK/imperial fluid ounces are 28.4131 mL, so they differ by about 4%.
How many mL in a US fluid ounce?
Exactly 29.5735295625 milliliters.
Why do US and UK differ?
They define the gallon differently, which cascades down to the fluid ounce.
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Updated: June 7, 2026