How to Convert Fluid Ounces to Milliliters
To convert fluid ounces to milliliters, multiply the number of US fluid ounces by 29.5735, because one US fluid ounce is about 29.5735 milliliters. The formula is ml = fl oz × 29.5735. The converter above does it instantly. A quick estimate is that a fluid ounce is about 30 ml, so multiplying by 30 gets you close.
The OZ to ML Formula
One US fluid ounce equals about 29.5735 milliliters. To convert fluid ounces to milliliters, multiply by 29.5735; to convert milliliters back to fluid ounces, divide by it. There is also a UK/imperial fluid ounce of about 28.4131 ml, slightly smaller; this converter uses the US fluid ounce, the most commonly searched. Note this is a measure of liquid volume, not weight.
Worked Examples
1 fl oz: 1 × 29.5735 = 29.57 ml. 8 fl oz (a cup): 236.59 ml. 12 fl oz (a soda can): 354.88 ml. 16 fl oz (a pint): 473.18 ml. A 2 fl oz espresso shot is about 59 ml, and a 20 fl oz bottle is about 591 ml.
Common OZ to ML Values
Quick reference: 1 fl oz ≈ 29.57 ml, 2 fl oz ≈ 59 ml, 4 fl oz ≈ 118 ml, 8 fl oz ≈ 237 ml, and 16 fl oz ≈ 473 ml. For a fast estimate, treat a fluid ounce as 30 ml; for accuracy in recipes and cocktails, use the converter, which gives the precise US value.
Why Convert OZ to ML?
Fluid ounces are standard in the US for drinks and recipes, while milliliters are used worldwide and on labels. Converting fluid ounces to milliliters helps when following an international recipe, mixing cocktails that specify both units, reading drink labels, or measuring medicine. Because precise liquid amounts matter in baking and mixing, converting with the exact factor keeps results consistent.
Fluid Ounces, Milliliters, and Cups
US liquid volume links cleanly: 8 fluid ounces make a cup, 2 cups make a pint, and a tablespoon is about half a fluid ounce (15 ml). In metric, a fluid ounce is about 29.57 ml, so a cup (8 fl oz) is about 237 ml. Knowing these connections lets you scale recipes and substitute measuring tools. The converter supports fluid ounces, milliliters, cups, pints, quarts, liters, tablespoons, and teaspoons.
US and UK Fluid Ounces
If a result looks slightly off against a British source, the fluid-ounce type is usually why. The US fluid ounce is about 29.57 ml, while the UK imperial fluid ounce is about 28.41 ml — a little smaller. Confusingly, the UK pint contains 20 imperial fluid ounces while the US pint contains 16. For US recipes and products, the 29.57 ml value used here is correct; for a British recipe, treat a fluid ounce as 28.41 ml.
Quick Tips for OZ to ML
For mental math, treat a fluid ounce as 30 ml: a 12 fl oz can is about 360 ml and an 8 fl oz cup about 240 ml. Remember this is liquid volume, not weight — a fluid ounce of water weighs about an ounce, but other liquids differ. For precise measuring in recipes, cocktails, or medicine, use the exact 29.5735 factor from the converter rather than the rounded estimate.
Frequently Asked Questions
How many ml in a fluid ounce?
One US fluid ounce is about 29.57 ml; one UK fluid ounce is about 28.41 ml.
How do I convert oz to ml?
Multiply the US fluid ounces by 29.5735. For example, 8 fl oz = 237 ml.
How many ml is 12 oz?
12 US fluid ounces is about 355 ml.
Fluid Ounces in Drinks and Recipes
Fluid ounces are the everyday US unit for liquids, so converting them to milliliters is one of the most common kitchen and bar conversions. Drink sizes are quoted in fluid ounces — a 12 fl oz can is about 355 ml, a 16 fl oz pint about 473 ml, a 20 fl oz bottle about 591 ml — so converting helps you understand volumes in metric terms. Cocktail recipes often list spirits in fluid ounces while garnishes and mixers may be in milliliters, and converting puts everything on one scale for accurate mixing.
Baking and medicine are two more places this conversion matters, because both reward precision. A recipe written in milliliters is easy to follow once you convert your fluid-ounce measures, and a liquid medicine dose given in milliliters can be related to a fluid-ounce measuring cup. Keep in mind the fluid ounce measures volume, not weight, and that the UK fluid ounce (about 28.41 ml) is slightly smaller than the US one (about 29.57 ml). The converter supports fluid ounces, milliliters, cups, pints, quarts, and liters for any liquid measurement.