Ounces to Milliliters Calculator
fl oz
Milliliters:
Liters:
Milliliters if imperial fluid ounces:
Calculation:
This calculator converts US fluid ounces to milliliters. Type a volume in fluid ounces and you get the result in milliliters and in liters. It is useful for recipes, drinks, baby bottles and product labels.
One warning first. The ounce in this calculator is the US fluid ounce, a unit of volume. It is not the ounce of weight (about 28.35 g), and it is slightly bigger than the imperial fluid ounce used in the UK (28.41 mL). Both differences are explained below.
How to use the ounces to milliliters calculator?
Step 1: Type the volume in US fluid ounces. Decimals can be written with a point or a comma.
Step 2: Click Convert or press Enter.
Step 3: The result in milliliters appears on the right. Below it you get the liters and the milliliters you would have with imperial fluid ounces.
Step 4: The Calculation box shows the multiplication with your numbers.
Fluid ounces to milliliters formula
One US fluid ounce is exactly 29.5735295625 mL, because it is 1/128 of a US gallon. To convert fluid ounces to milliliters, multiply by 29.5735295625:
| V(mL) = V(fl oz) × 29.5735295625 |
For mental math, use 30 mL per fluid ounce. It is a little high, by about 1.4 percent, which is fine for most kitchen work.
Three different ounces
| Unit | What it measures | Size |
|---|---|---|
| US fluid ounce (fl oz) | Volume | 29.5735295625 mL |
| Imperial fluid ounce (UK) | Volume | 28.4130625 mL |
| Ounce (oz) of weight | Weight | 28.349523125 g |
A US fluid ounce of water weighs about 1.043 ounces of weight, so the two are close but not equal. For weight, use the pounds and ounces to kilograms calculator.
Ounces to milliliters examples
Example 1: How many milliliters is a cup (8 fl oz)?
V(mL) = 8 × 29.5735295625 ≈ 236.59 mL
A US cup is 236.59 mL. Recipes often round it to 240 mL.
Example 2: A 12 fl oz can of soda
V(mL) = 12 × 29.5735295625 ≈ 354.88 mL
The can holds 354.88 mL, which is why metric labels show 355 mL.
Example 3: A 16.9 fl oz water bottle
V(mL) = 16.9 × 29.5735295625 ≈ 499.79 mL
That is the familiar half-liter bottle: 499.79 mL is very close to 500 mL.
Example 4: A 4 fl oz baby bottle
V(mL) = 4 × 29.5735295625 ≈ 118.29 mL
A 4 fl oz feeding is 118.29 mL. With imperial ounces the same number would be 113.65 mL.
Ounces to milliliters chart
| US fluid ounces (fl oz) | Milliliters (mL) | US cups |
|---|---|---|
| 0.5 fl oz | 14.79 mL | 0.0625 |
| 1 fl oz | 29.57 mL | 0.125 |
| 2 fl oz | 59.15 mL | 0.25 |
| 3 fl oz | 88.72 mL | 0.375 |
| 4 fl oz | 118.29 mL | 0.5 |
| 5 fl oz | 147.87 mL | 0.625 |
| 6 fl oz | 177.44 mL | 0.75 |
| 8 fl oz | 236.59 mL | 1 |
| 10 fl oz | 295.74 mL | 1.25 |
| 12 fl oz | 354.88 mL | 1.5 |
| 16 fl oz | 473.18 mL | 2 |
| 16.9 fl oz | 499.79 mL | 2.113 |
| 20 fl oz | 591.47 mL | 2.5 |
| 24 fl oz | 709.76 mL | 3 |
| 32 fl oz | 946.35 mL | 4 |
| 64 fl oz | 1892.71 mL | 8 |
| 128 fl oz | 3785.41 mL | 16 |
Frequently asked questions
How many milliliters are in an ounce?
A US fluid ounce is 29.57 mL. The exact value is 29.5735295625 mL.
Is a fluid ounce the same as an ounce of weight?
No. A fluid ounce measures volume and an ounce of weight measures mass. They happen to be close for water, but they are different units, and for other liquids such as honey or oil the weights differ more.
Is a US fluid ounce the same as a UK fluid ounce?
No. A US fluid ounce is 29.57 mL and an imperial fluid ounce is 28.4130625 mL, about 3.9 percent smaller. A UK pint has 20 imperial fluid ounces, while a US pint has 16 US fluid ounces.
How many ounces are in a liter?
A liter is 33.81 US fluid ounces.
Related calculators
- Liters to Gallons Calculator (L → gal)
- Gallons to Liters Calculator (gal → L)
- Pounds and Ounces to Kilograms Calculator (lb+oz → kg)
- Kilograms to Pounds and Ounces Calculator (kg → lb+oz)
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