Fluid ounces to milliliters (fl oz to mL) conversion factors for US customary and imperial measurement systems are listed below. To find out how many milliliters in ounces, multiply by the conversion factor or use the converter if the conversion is from US fluid ounces.
1 Fluid Ounce [US] = 29.5735296 Milliliters
1 Fluid Ounce [UK] = 28.4130625 Milliliters
There are 29.5735296 milliliters in an ounce, because by definition 1 liter equals to the volume of 1 kilogram of water and the same amount of water equals to 33.814 fluid ounces. If you divide the number of milliliters in a liter (1000 ml) by the number of fl. oz in a liter (33.814), that makes 1000 / 33.814 = 29.5735296 ml. in an ounce.
For example, to find out how many milliliters there are in a half fl. ounce, multiply the fl. ounce value by the conversion factor, that makes 1/2 fl oz * 29.5735296 = 14.8 ml. in a half fl. ounce.
For US fluid ounces, (approximately) there are 3.7 ml in 1/8 fl.oz, 7.4 ml in a quarter (1/4) fl.oz, 9.85 ml in 1/3 fl.oz, 19.7 ml in 2/3 fl.oz and 22.2 ml in 3/4 fl.oz.
For UK fluid ounces, (approximately) there are 3.55 ml in 1/8 fl.oz, 7.1 ml in a quarter (1/4) fl.oz, 9.5 ml in 1/3 fl.oz, 18.9 ml in 2/3 fl.oz and 21.3 ml in 3/4 fl.oz.
Fluid ounce is an imperial and US customary volume unit. Fluid ounce is different than ounce which is mass (weight) unit. There are 8 fl. ounces in a cup, 16 fl.oz in a pint, 32 fl.oz in a quart and 128 fl.oz in a gallon. The abbreviation for fluid ounce is "fl. oz.".
Milliliter (millilitre in SI spelling) is a volume unit in metric system. 1 milliliter is 1/1000 of a liter. The abbreviation for milliliter is "mL" or "ml".
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