How Do You Convert Fluid Ounces to Milliliters?
Multiply the number of fluid ounces by 29.5735 to get milliliters. The formula is: Milliliters = Fluid Ounces x 29.5735. To convert in the other direction, divide milliliters by 29.5735 to get fluid ounces. This conversion uses the US fluid ounce, which is the standard volume measurement for liquids in the United States.
For a quick mental estimate, round up to 30 mL per fluid ounce. This shortcut is only off by about 1.4 percent, which is close enough for most cooking and casual measurements. For precise work like cocktail mixing or laboratory measurements, use the exact factor of 29.5735.
Marco Ferreira at Marco's Kitchen in Pinewood Falls uses this conversion every night behind the bar. His signature Negroni calls for 1.5 fl oz each of gin, Campari, and sweet vermouth. When a visiting bartender from Milan asked for the recipe in milliliters, Marco multiplied: 1.5 x 29.5735 = 44.36 mL per ingredient, which rounds neatly to 45 mL for a standard European jigger pour.
Common Fluid Ounce to Milliliter Conversions
The table below lists common fluid ounce amounts you will encounter in recipes, beverages, and product labels, along with their milliliter equivalents.
| Fluid Ounces | Milliliters | Common Example |
|---|---|---|
| 0.5 fl oz | 14.79 mL | 1 tablespoon |
| 1 fl oz | 29.57 mL | Standard shot (single) |
| 1.5 fl oz | 44.36 mL | Standard US jigger |
| 2 fl oz | 59.15 mL | Double shot |
| 4 fl oz | 118.29 mL | Small juice glass |
| 6 fl oz | 177.44 mL | Standard teacup |
| 8 fl oz | 236.59 mL | 1 US cup |
| 12 fl oz | 354.88 mL | Standard soda can |
| 16 fl oz | 473.18 mL | US pint / large water bottle |
| 16.9 fl oz | 500 mL | Standard water bottle |
| 32 fl oz | 946.35 mL | US quart |
| 33.8 fl oz | 1,000 mL | 1 liter |
US Fluid Ounce vs. Imperial Fluid Ounce
The United States and the United Kingdom each define the fluid ounce differently. This causes confusion when following British recipes or comparing US and UK product sizes. The table below shows the key differences.
| Measurement | US Fluid Ounce | Imperial Fluid Ounce |
|---|---|---|
| Volume in mL | 29.5735 mL | 28.4131 mL |
| Ounces per cup | 8 fl oz = 1 US cup | 10 fl oz = 1 imperial cup |
| Ounces per pint | 16 fl oz = 1 US pint | 20 fl oz = 1 imperial pint |
| Ounces per gallon | 128 fl oz = 1 US gallon | 160 fl oz = 1 imperial gallon |
The imperial fluid ounce is about 4 percent smaller in volume, but imperial pints and gallons contain more fluid ounces. An imperial pint is 20 fl oz (568.26 mL), while a US pint is only 16 fl oz (473.18 mL). This is why a pint of beer in a British pub is noticeably larger than a US pint. If you follow a British recipe that calls for "10 fl oz," that is one imperial cup (284.13 mL), not the 295.74 mL you would get from 10 US fluid ounces.
When Do You Need This Conversion?
Fluid ounce to milliliter conversions come up in cooking, bartending, medicine, and product comparison. Here are the most common scenarios where this calculator helps.
Cocktail and Beverage Recipes
American cocktail recipes measure spirits in fluid ounces, while most of the world uses milliliters. Marco Ferreira trained his bar staff at Marco's Kitchen to work in both systems. A classic Margarita calls for 2 fl oz tequila, 1 fl oz lime juice, and 0.75 fl oz triple sec. In metric terms, that is 59 mL tequila, 30 mL lime juice, and 22 mL triple sec. Marco keeps a printed conversion chart taped inside the bar cabinet for quick reference.
Baking with Metric Recipes
Leah Novak at Rise and Shine Bakery in Pinewood Falls regularly adapts European pastry recipes for her American kitchen. A French brioche recipe called for 150 mL of warm milk. She divided by 29.5735 to get 5.07 fl oz, which she measured as 5 fluid ounces plus a splash. For her lemon curd filling, precision matters more: 80 mL of lemon juice converts to 2.71 fl oz, so she measures exactly 2 and 3/4 fluid ounces.
Medicine and Health
Liquid medications are often labeled in milliliters, but many Americans think in fluid ounces. A standard dose cup holds 1 fl oz (30 mL). Cough syrup doses are typically 10 mL or 15 mL, which equals roughly one-third or one-half of a fluid ounce. Always use the measuring device that comes with the medication for accuracy, since the difference between 10 mL and 15 mL (just 0.17 fl oz) can matter for dosing.
Comparing International Products
Imported beverages, cosmetics, and household products list volume in milliliters. A 330 mL European soda can equals 11.16 fl oz, slightly less than a standard US 12 fl oz can. A 750 mL wine bottle equals 25.36 fl oz. Maya Singh compared these sizes for a consumer math project at Pinewood Falls High, discovering that European soft drink cans are about 7 percent smaller than their American counterparts.