Ounces to milliliters (oz to mL) conversion factors are listed below. To find out how many milliliters in ounces, multiply by the conversion factor or use the converter.
1 Fluid Ounce [US] = 29.5735296 Milliliters
1 Fluid Ounce [UK] = 28.4130625 Milliliters
There are 29.57 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 mL in a liter (1000 mL) by the number of fl. oz in a liter (33.814), that makes 1000 / 33.814 = 29.5 mL in an ounce.
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".