Fluid Ounces to Millilitres converter
Recipes, drink sizes and bottle labels often switch between US fluid ounces and millilitres depending on where they were written. This free volume converter changes US fluid ounces (fl oz) into millilitres (mL) and back again — so you can follow an American recipe with a metric measuring jug, or read a metric label in familiar ounces.
How it works
The US fluid ounce is defined exactly as 29.5735295625 mL. To convert fluid ounces to millilitres the tool multiplies by that factor; to go the other way it divides by it. Type a value in either field and the opposite field updates instantly, in both directions. Note that this is the US fluid ounce — the UK imperial fluid ounce is a slightly smaller 28.4131 mL.
Common conversions at a glance
| US fluid ounces (fl oz) | Millilitres (mL) | Common context |
|---|---|---|
| 1 fl oz | 29.57 mL | Shot glass (US) |
| 4 fl oz | 118.29 mL | Quarter cup |
| 8 fl oz | 236.59 mL | One US cup |
| 12 fl oz | 354.88 mL | Standard soda can |
| 16 fl oz | 473.18 mL | US pint / large water bottle |
| 32 fl oz | 946.35 mL | US quart |
| 64 fl oz | 1,892.71 mL | Half gallon |
US vs UK fluid ounces — an important distinction
The US fluid ounce (29.5735 mL) and the UK (imperial) fluid ounce (28.4131 mL) look similar but differ by about 4%. That gap adds up across a recipe. For example, 8 fl oz of a liquid is 236.59 mL in the US system but only 227.30 mL in the UK system — a difference of about 9 mL, which matters for baking where precision is critical.
This converter uses the US fluid ounce. If a recipe comes from the UK, Australia, or another country that uses the imperial system, the conversion will be slightly off. Most modern UK recipes now use metric measurements (grams and millilitres) rather than imperial fluid ounces, which sidesteps the ambiguity. When in doubt, check whether the recipe lists an 8 fl oz cup as approximately 237 mL (US) or 284 mL (UK half-pint) — that tells you which system it uses.
Practical cooking and bartending uses
Cooking. Many American recipe sites list liquid ingredients in cups and fluid ounces while European sites use millilitres. A recipe calling for 6 fl oz of cream becomes 177.44 mL — easy to measure in a metric jug.
Bartending. Standard US spirit measurements are given in ounces: a jigger is typically 1.5 fl oz (44.36 mL). Metric bar tools in many countries use 50 mL as a standard measure, so converting between the two helps when following cocktail recipes written in a different system.
Medication and supplements. Liquid medications sometimes list dosing in teaspoons (approximately 4.93 mL) or tablespoons (approximately 14.79 mL) rather than fluid ounces, but dosing charts for adults may show fluid ounce amounts. Converting ensures accurate dosing — always verify with the packaging or a pharmacist for medical purposes.
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