Free · Volume conversions

US Fluid Ounces to Milliliters Conversion Calculator

Convert us fluid ounces to milliliters with exact unit factors, editable results and an explained example.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

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Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

1 US fl oz = 29.5735295625 mL. Use the US fluid ounce for this identity. An imperial fluid ounce is 28.4130625 milliliters, so the systems are not interchangeable. Enter a known value in the units shown; editing a result solves the conversion in reverse.

1 US fl oz = 29.5735295625 mL

Worked example

Enter these known values and leave the other values blank.

Volume in ounces
1 US fl oz
Volume in milliliters
29.6 mL

Assumptions and limitations

  • Use the US fluid ounce for this identity. An imperial fluid ounce is 28.4130625 milliliters, so the systems are not interchangeable.
  • The worked example uses the starting units. A unit selection preserves the quantity, so check the unit before entering a new number.
  • Where offered, a metric cup is 250 mL, a US legal cup is 240 mL, and the metric spoon choices are 5 mL and 15 mL. Fluid ounces measure volume rather than mass.

Common questions

Which volume convention does this conversion use?

Use the US fluid ounce for this identity. An imperial fluid ounce is 28.4130625 milliliters, so the systems are not interchangeable.

How should I use a rounded result?

Keep enough digits for the accuracy of the original measurement. Display rounding changes the visible precision, while the calculation retains additional digits.

References

The US fluid ounce uses one 128th of the exact US liquid gallon, replacing the rounded captured reciprocal factor.

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