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ml to Ounces
Convert millilitres to fluid ounces in both systems at once — the US fluid ounce is 29.57 ml but the imperial one is 28.41 ml — and see what the answer is in ounces of weight.
US fluid ounces
3.38
1 US fl oz = 29.574 ml
Imperial fluid ounces (UK)
3.52
1 imperial fl oz = 28.413 ml
Imperial fluid ounces are about 4% smaller than US ones. American recipes always mean the US fluid ounce; British and Irish recipes published before metrication mean the imperial one.
If you meant ounces of weight
3.53 oz
Weight ounces depend on what is in the jug — water is 1.00 g/ml. For anything not listed, use the ingredient converter with over a hundred densities.
- Cups (US)
- 0.423
- Tablespoons (US)
- 6.76
- Teaspoons (US)
- 20.3
- Pints (US)
- 0.211
- Pints (UK / imperial)
- 0.176
- Quarts (US)
- 0.106
- Litres
- 0.1
- Metric Cups (250 ml)
- 0.4
ml to fluid ounces chart
The same volume, read in both systems. Use the US column for American recipes.
| Millilitres | US fl oz | Imperial fl oz |
|---|---|---|
| 5 ml | 0.169 | 0.176 |
| 15 ml | 0.507 | 0.528 |
| 30 ml | 1.01 | 1.06 |
| 50 ml | 1.69 | 1.76 |
| 100 ml | 3.38 | 3.52 |
| 125 ml | 4.23 | 4.4 |
| 150 ml | 5.07 | 5.28 |
| 200 ml | 6.76 | 7.04 |
| 240 ml | 8.12 | 8.45 |
| 250 ml | 8.45 | 8.8 |
| 300 ml | 10.1 | 10.6 |
| 500 ml | 16.9 | 17.6 |
| 750 ml | 25.4 | 26.4 |
| 1000 ml | 33.8 | 35.2 |
Fluid ounces to ml chart
| Fluid ounces | US → ml | Imperial → ml |
|---|---|---|
| 1 fl oz | 29.6 ml | 28.4 ml |
| 2 fl oz | 59.1 ml | 56.8 ml |
| 3 fl oz | 88.7 ml | 85.2 ml |
| 4 fl oz | 118 ml | 114 ml |
| 5 fl oz | 148 ml | 142 ml |
| 6 fl oz | 177 ml | 170 ml |
| 8 fl oz | 237 ml | 227 ml |
| 10 fl oz | 296 ml | 284 ml |
| 12 fl oz | 355 ml | 341 ml |
| 16 fl oz | 473 ml | 455 ml |
| 20 fl oz | 591 ml | 568 ml |
| 32 fl oz | 946 ml | 909 ml |
US customary vs imperial, unit by unit
Fluid ounces differ by only 4%, but pints and gallons differ by 20% — which is where recipes really go wrong.
| Unit | US customary | Imperial (UK) |
|---|---|---|
| 1 fluid ounce | 29.574 ml | 28.413 ml |
| 1 cup | 236.6 ml (8 fl oz) | not a standard imperial unit |
| 1 pint | 473.2 ml (16 fl oz) | 568.3 ml (20 fl oz) |
| 1 quart | 946.4 ml (32 fl oz) | 1136.5 ml (40 fl oz) |
| 1 gallon | 3.785 L (128 fl oz) | 4.546 L (160 fl oz) |
| 1 tablespoon | 14.79 ml | 15 ml (metric convention) |
| 1 teaspoon | 4.93 ml | 5 ml (metric convention) |
Three different things are called an ounce
This is the single biggest source of confusion in recipe conversion, and it is worth being precise about:
- The US fluid ounce — 29.574 ml. A unit of volume. This is what American recipes, drink recipes and US nutrition labels mean.
- The imperial fluid ounce — 28.413 ml. Also volume, used in older British, Irish and Commonwealth cookbooks.
- The ounce of weight — 28.350 g. A unit of mass, written just oz. This is what a recipe means when it asks for 4 oz of chocolate.
If a recipe lists a dry ingredient in ounces, it almost always means weight. If it lists a liquid in ounces, it usually means fluid ounces. When a recipe says something like “8 oz cream cheese”, that is weight — 227 g — even though cream cheese is soft.
The water coincidence
The imperial fluid ounce was originally defined as the volume occupied by one avoirdupois ounce of water. That is why 1 imperial fl oz (28.41 ml) of water weighs 28.35 g, almost exactly 1 oz. It is a genuinely useful shortcut — but only for water, and only in the imperial system. A US fluid ounce of water weighs about 1.04 oz, and a fluid ounce of honey weighs roughly 1.5 oz.
Watch the pint, not the ounce
A 4% difference in fluid ounces rarely ruins anything. A pint is a different story: the imperial pint is 568 ml against the US 473 ml. Follow a British recipe calling for a pint of milk using US pints and you are 95 ml short — enough to change a custard or a batter. The same applies to quarts and gallons, which are simply multiples of the pint.
When to stop converting and start weighing
Volume conversions between ml and fluid ounces are exact, because both measure the same thing. The moment an ingredient is dry or sticky, volume stops being reliable at all — flour can vary by 20% per cup depending on how it was scooped. For those, convert to grams with the ingredient converter, or read why cups to grams depends on the ingredient. If you are working through a whole American recipe, the recipe to metric tool does every line at once.
Frequently asked questions
How many ml in a fluid ounce?
It depends on the system. A US fluid ounce is 29.5735 ml. An imperial (UK) fluid ounce is 28.4131 ml — about 4% smaller. American recipes mean the US one.
How many ml is 8 oz?
8 US fluid ounces is 236.6 ml, which is also exactly one US cup. 8 imperial fluid ounces is 227.3 ml. If the recipe means 8 ounces of weight, it is 227 g and the volume depends on the ingredient.
Why are US and imperial fluid ounces different sizes?
They were defined from different starting points. The imperial fluid ounce is 1/160 of an imperial gallon, originally the volume of one ounce of water. The US fluid ounce is 1/128 of a US gallon, which was based on an older English wine gallon. Neither was adjusted to match the other.
Is a fluid ounce the same as an ounce?
No. A fluid ounce measures volume, an ounce measures weight. They only coincide for water, and only in the imperial system — 1 imperial fl oz of water weighs almost exactly 1 oz. For oil, honey or flour the two numbers are far apart.
Is a UK pint the same as a US pint?
No, and this catches people out more than fluid ounces do. A US pint is 16 US fl oz (473 ml). An imperial pint is 20 imperial fl oz (568 ml) — 20% larger.
Which should I use for a British recipe?
Modern British recipes are written in millilitres and grams, so you rarely need imperial fluid ounces at all. Only reach for them when the book is older than about 1980 or explicitly says imperial.