This oz to ml converter turns US fluid ounces into milliliters as you type. It is the one to open with a baby bottle, a cocktail recipe, a measuring jug marked in ml, or a cup size from a US café that you want in metric. It runs in your browser and spends no credits.
How many ml are in an ounce
One US fluid ounce is exactly 29.5735295625 milliliters, just under 30 ml. Eight fluid ounces make a US customary cup, 236.59 ml, and 128 make a US gallon, 3,785.41 ml.
These are fluid ounces, a measure of volume. A recipe that weighs flour or cheese in ounces means the ounce of weight, which converts to grams instead; see Oz to Grams.
Oz to ml formula
Multiply the fluid ounces by 29.5735:
ml = fl oz × 29.5735295625
Multiplying by 30 is a fair estimate for small amounts and runs about 1.4 percent high: 16 fl oz × 30 is 480 ml, while the exact figure is 473.18 ml.
Fluid ounces to milliliters chart
| US fl oz | Milliliters |
|---|---|
| 0.5 fl oz | 14.79 ml |
| 1 fl oz | 29.57 ml |
| 1.5 fl oz | 44.36 ml |
| 2 fl oz | 59.15 ml |
| 3.4 fl oz | 100.55 ml |
| 4 fl oz | 118.29 ml |
| 5 fl oz | 147.87 ml |
| 6 fl oz | 177.44 ml |
| 8 fl oz | 236.59 ml |
| 12 fl oz | 354.88 ml |
| 16 fl oz | 473.18 ml |
| 20 fl oz | 591.47 ml |
| 32 fl oz | 946.35 ml |
| 64 fl oz | 1,892.71 ml |
Worked example: a baby bottle and a cocktail
A feeding guide says 4 fl oz per bottle. In milliliters that is 4 × 29.5735 = 118.29 ml, so the 120 ml line on a metric bottle is a hair over. Behind the bar, a 1.5 fl oz pour is 44.36 ml, and a 2 fl oz double is 59.15 ml.
US vs UK ounces and pints
The preset is US customary. A UK fluid ounce is 28.4130625 ml, slightly smaller, and a UK pint holds 20 UK fluid ounces, 568.26 ml, while a US pint holds 16 US fluid ounces, 473.18 ml. So a British pint glass holds about a fifth more than an American one. If your recipe is British, convert with that in mind.
FAQ
How many ml is 8 oz?
236.59 ml for 8 US fluid ounces, which is one US customary cup.
Is oz the same as fl oz?
Not always. On a liquid label, oz usually means fluid ounces. On food sold by weight, oz is the ounce of mass, 28.35 g.
What does it cost?
It comes with the Nexin library: Nexin Lite or Nexin Pro opens it, and it spends no credits.
