Convert Milliliters to Fluid Ounces (ml to fl oz)
1 US fluid ounce is defined as exactly 1/128 of a US gallon — about 29.5735 ml. This calculator uses US customary liquid measures only; the UK imperial fluid ounce is a different, smaller unit not covered here.
Quick converter
Common conversions
Common milliliter values from recipes and product labels and their exact US fluid ounce equivalents.
| Milliliters (ml) | US Fluid Ounces (fl oz) |
|---|---|
| 100 ml | 3.38 fl oz |
| 150 ml | 5.07 fl oz |
| 250 ml | 8.45 fl oz |
| 300 ml | 10.14 fl oz |
| 500 ml | 16.91 fl oz |
| 750 ml | 25.36 fl oz |
| 1,000 ml | 33.81 fl oz |
Rounded for readability. Use the converter above for exact decimals.
How it works
This direction is for when you already have a volume in milliliters — a European recipe, a skincare or cosmetics product label, a wine bottle — and need it in US fluid ounces to follow a US recipe, compare against a US product size, or check it against a US-labeled limit.
Baking is the clearest trigger: many international recipes measure liquids in milliliters, but US recipes use cups, and one US cup is exactly 8 fl oz (236.59 ml). A European recipe calling for 250 ml of milk converts to about 8.45 fl oz — close to but not exactly one US cup, which is a common source of slightly-off baking results when someone eyeballs "about a cup" instead of converting precisely.
Travel liquid limits are another common case: the international carry-on rule restricts liquids to containers of 100 ml or less, which converts to about 3.4 fl oz — the exact figure many US airport signs display, since both rules describe the same underlying limit in different units.
Bottle and product sizes are the third common trigger: a European wine bottle at 750 ml converts to about 25.4 fl oz, and a skincare product labeled 50 ml converts to about 1.7 fl oz, useful for comparing against a similar US product's labeled size before ordering internationally.
Containers printed with both scales are where the rounding becomes visible. Measuring jugs, feeding bottles and travel containers sold internationally carry millilitres down one side and fluid ounces down the other, and the two sets of marks sit at convenient round numbers rather than at exact equivalents: 4 fl oz is 118.3 ml but the metric mark beside it is normally printed as 120 ml, and 8 fl oz is 236.6 ml against a printed 240 ml. The gap is only about 1.4%, but it repeats every time another measure is added to the same recipe.
Frequently asked questions
- How many fl oz is 250 ml?
- 250 ml equals about 8.45 fl oz (250 ÷ 29.5735). That is close to, but not exactly, one US cup (8 fl oz / 236.59 ml) — a common point of confusion when converting a European recipe.
- How do I convert ml to fl oz without a calculator?
- Divide the milliliter value by 30 for a rough estimate, or by 29.5735 for a precise one. For example, 250 ml ÷ 30 ≈ 8.3, close to the exact 8.45 fl oz.
- My European recipe calls for 250 ml of liquid — is that the same as 1 US cup?
- Not exactly. 250 ml is about 8.45 fl oz, while 1 US cup is exactly 8 fl oz (236.59 ml). The difference is small (about 5%) but can add up across several ingredients in a recipe with tight ratios, like bread or pastry.
- A skincare product is labeled 50 ml — how does that compare to a US product labeled in fl oz?
- 50 ml converts to about 1.69 fl oz. US cosmetics are commonly sold in 1, 2, or 4 fl oz sizes, so a 50 ml European product sits just under the common 1.7 fl oz mark and slightly above a 1 fl oz US travel-size bottle.
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Last updated: 2026-08-22