OZ to ML Converter

How to convert fluid ounces to milliliters

1 fluid ounce = 29.57352956 milliliters. To convert fluid ounces to milliliters, multiply by 29.57352956. A US fluid ounce is 1/128 of a US gallon, exactly 29.5735295625 ml. A milliliter is one thousandth of a liter, the same as one cubic centimeter.

Worked examples

• 2 fluid ounces = 59.1471 ml (2 × 29.57353)
• 8 fluid ounces = 236.588 ml (8 × 29.57353)
• 16 fluid ounces = 473.176 ml (16 × 29.57353)

Where this conversion comes up

Fluid ounces are used for drink cans, baby bottles, cosmetics and US recipes; milliliters for medicine doses, drinks, perfume and recipes outside the US. For baby bottles, cocktails and US recipes. Uses US fluid ounces (29.57 ml). An 8 fl oz cup is 236.6 ml; nutrition labels round it to 240 ml.

Quick estimate

Multiply by 30 (1.4% high): 6 fl oz ≈ 180 ml, exact 177.4 ml.

Common mistakes

• Dividing instead of multiplying. A milliliter is smaller than a fluid ounce, so the number of milliliters must come out larger: 2 fluid ounces = 59.1471 ml.
• Mixing fluid ounces with weight ounces. A fluid ounce is a volume (29.57 ml); an ounce on a kitchen scale is a weight (28.35 g). A cup of flour is 8 fl oz by volume but only about 4.25 oz by weight.
• Using the imperial (UK) unit. This page uses US measures. An imperial gallon is 4.546 L (20% more than a US gallon), an imperial pint 568 ml and an imperial fluid ounce 28.41 ml.
• Rounding too early. Keep the full factor until the last step; rounding 29.6 to 30 first puts large values noticeably off.

Going the other way? Use the ml to oz converter. Related volume converters: liters to gallons, gallons to liters, liters to quarts, quarts to liters, gallons to quarts, oz to cups.