1 US fluid ounces to milliliters
29.57 mL
1 fl oz = 29.57 mL.
milliliters
29.57mL
1 fl oz = 29.57 mL
In short
How many milliliters is 1 US fluid ounces?
1 fl oz = 29.57 mL. 1 US fluid ounce = 29.573530 milliliters, so the working is 1 × 29.573530 = 29.57.
The working
The factor below is an exact definition rather than a measurement, so nothing is approximated in the arithmetic. The only rounding on this page happens where a number is displayed.
1 US fluid ounce = 29.573530 milliliters 1 × 29.573530 = 29.57
How much precision do you need?
Each row is the same answer cut at a different number of decimals, with what that choice costs you. Pick the shortest row whose error is smaller than whatever you are measuring with.
| Rounded to | Answer (mL) | Off by |
|---|---|---|
| Whole number | 30 | +0.42647 |
| 1 decimal | 29.6 | +0.02647 |
| 2 decimals | 29.57 | −0.00353 |
Round trip: take 29.57 mL back the other way and you land on 0.9999 fl oz — a drift of 0.0001 fl oz. That gap is the rounding, not the conversion.
What 1 fl oz looks like
1 fl oz
One US fluid ounce is 29.5735295625 mL, because the gallon is defined as exactly 231 cubic inches.
Frequently asked questions
What is 1 US fluid ounces in milliliters?
1 US fluid ounces is 29.57 milliliters. 1 US fluid ounce = 29.573530 milliliters, so the working is 1 × 29.573530 = 29.57.
How accurate is 29.57 mL?
Rounding to 29.57 mL and converting straight back gives 0.9999 fl oz, a drift of 0.0001 fl oz from the 1 you started with. The factor itself is exact; every bit of that difference comes from the rounding, not the conversion.
Nearby values
Any value at all
Fluid Ounces to mL Converter
Convert US fluid ounces to milliliters — metric measuring jugs and bottle labels.
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