ML to OZ Converter
Millilitres in, fluid ounces out — live, free, and entirely in your browser.
Need the opposite? OZ to ML
This ml to oz converter turns millilitres into US fluid ounces the moment you type. The formula: fl oz = ml ÷ 29.5735 (or ml × 0.033814). One US fluid ounce is just under 30 ml, which makes the mental version easy: divide by 30.
Feeding a baby is the most common reason people need this direction. Formula tins and paediatric guidance often mix units: a 120 ml bottle is 4.06 fl oz, and 180 ml is 6.09 fl oz — so the "4 oz" and "6 oz" marks on a US bottle line up almost exactly. In the kitchen, a metric recipe's 250 ml of milk is 8.45 fl oz, and 500 ml of stock is 16.91 fl oz — close to the US pint of 16 fl oz, but not identical.
Like every ConvertForever tool, the conversion runs locally in your browser. Free, instant, no sign-up, and nothing you type is uploaded.
How to convert ml to oz
- Type the volume in millilitres into the input box.
- Read the fluid-ounce result instantly — it updates as you type.
- Adjust the ml value to check several quantities in a row.
- Use the swap control to flip to oz to ml.
- Copy the result with one click.
Everyday millilitre amounts in fluid ounces
Drinks first: a 330 ml can is 11.16 fl oz, a 500 ml bottle of water is 16.91 fl oz, a 750 ml wine bottle is 25.36 fl oz, and a 1-litre carton is 33.81 fl oz. A standard 25 ml spirit measure in a UK pub pours 0.85 fl oz — noticeably smaller than the US 1.5 oz shot.
For cooking and medicine: 5 ml is a teaspoon (0.17 fl oz), 15 ml is a tablespoon (0.51 fl oz), and 240 ml is what US recipes treat as one cup (8.12 fl oz by the exact maths, rounded to 8). Liquid medicine doses given in ml can be sanity-checked against oz-marked droppers the same way.
The exact factor, and why it is not a round 30
One US fluid ounce is defined as 29.5735 millilitres, so the conversion is fl oz = ml ÷ 29.5735, or equivalently ml × 0.033814. The number is awkward because the US ounce descends from the old system of 128 fluid ounces to the US gallon, which never lined up neatly with the metric litre.
This converter uses the US fluid ounce, since that is what nearly all modern recipes, nutrition labels and drink sizes mean. The UK imperial fluid ounce is a different 28.4131 ml — about 4% smaller — so a British measurement needs the imperial figure instead, a point worth checking on older UK recipes.
A worked example, step by step
Convert a 750 ml wine bottle. Apply fl oz = ml ÷ 29.5735: 750 ÷ 29.5735 = 25.36 fl oz. Rounded for a label or a note, that is about 25.4 US fluid ounces — essentially the same as a US 'fifth' of spirits, which is now standardised at 750 ml.
Check by reversing: 25.36 × 29.5735 = 750 ml, back to the start. The reverse multiply is the quickest way to spot the usual slip of multiplying by 29.57 instead of dividing, which would balloon the answer into the tens of thousands.
A quick-reference set of common millilitres
Keep these to hand: 15 ml = 0.51 fl oz (a tablespoon), 50 ml = 1.69 fl oz (a miniature spirit), 100 ml = 3.38 fl oz (the carry-on limit), 250 ml = 8.45 fl oz, 500 ml = 16.91 fl oz. The neat landmark is that 30 ml is almost exactly 1 fl oz, which is where the divide-by-30 shortcut comes from.
Scaling up, a 1-litre carton is 33.81 fl oz and a 2-litre bottle is 67.63 fl oz. Because the factor is constant you can add: 750 ml is simply 500 ml (16.91) plus 250 ml (8.45), giving 25.36 fl oz without a fresh calculation.
US versus UK fluid ounces in practice
The two ounces are close but not equal: 29.5735 ml in the US, 28.4131 ml in the imperial UK system. Confusingly, a UK pint holds 20 imperial fluid ounces while a US pint holds only 16 US fluid ounces, so a 'pint' differs by nearly 20% across the Atlantic even before the ounce sizes are counted.
For a single ounce the 4% gap rarely matters in cooking, but it adds up over large volumes and can mislead on drink servings. Since most labels, apps and recipes you will meet today are American, treating an ounce as the US 29.5735 ml is the safe default unless a source is specifically British.
Rounding, and fluid ounces versus weight
For kitchen and drink use, two decimals is ample and often one will do — 250 ml as 8.5 fl oz is close enough to cook by. The divide-by-30 shortcut runs about 1.4% low, invisible for a splash of milk but worth avoiding for medicine doses or duty-free limits, where the exact factor matters.
One thing the converter cannot do is turn volume into weight. A fluid ounce measures how much space a liquid takes up, not its mass; the ounce on a kitchen scale is weight (28.35 g). They roughly coincide only for water, so never swap a recipe's 'fl oz' of liquid for 'oz' of a dense ingredient like honey.
The reverse: ounces back to millilitres
To undo the conversion, multiply fluid ounces by 29.5735 — the reciprocal of the divide step, so a round trip returns your original millilitres exactly. The swap control flips the tool to oz to ml in one tap.
A quick check: because a millilitre is much smaller than a fluid ounce, any liquid has far more millilitres than ounces. If your ounce answer came out larger than the millilitres you typed, the operation was inverted — divide by 29.5735, do not multiply.
Frequently asked questions
What is the exact ml to oz formula?
Divide millilitres by 29.5735 to get US fluid ounces. So 250 ml ÷ 29.5735 = 8.45 fl oz. Multiplying by 0.033814 gives the same answer.
What is the quick mental trick?
Divide by 30. For 150 ml: 150 ÷ 30 = 5 fl oz (exact answer 5.07). The trick runs about 1.4% low, which is fine for cooking and drinks; use the converter when doses or duty-free limits are involved.
How many oz is 120 ml of baby formula?
120 ml is 4.06 fl oz, so a US "4 oz bottle" and a metric 120 ml feed are effectively the same amount. Likewise 60 ml ≈ 2 oz and 240 ml ≈ 8 oz.
Are US and UK fluid ounces the same?
No. A US fluid ounce is 29.5735 ml; a UK (imperial) fluid ounce is 28.4131 ml, about 4% smaller. This converter uses the US ounce, which is what almost all modern recipes and product labels mean.
How many oz is 500 ml?
500 ml is 16.91 US fl oz. Note that this is more than a US pint (16 fl oz) but less than an imperial pint (20 imperial fl oz, 568 ml).
Is this converter free and private?
Yes. There is no charge, no account and no limit, and the arithmetic runs on your device — nothing is sent to a server.