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Oz to ML Converter

Convert fluid ounces to milliliters instantly. Accurate to the exact NIST definition — free, no sign-up.

Quick Answer: One US fluid ounce equals exactly 29.5735 milliliters. To convert oz to ml, multiply by 29.5735. For example, 8 oz = 236.588 ml, and 16 oz = 473.176 ml.

Fluid Ounces to Milliliters Calculator

Milliliters (ml) 29.574 ml

Formula: ml = fl oz × 29.5735295625

📐 Oz to ML Formula

Milliliters = Fluid Ounces × 29.5735295625 Fluid Ounces = Milliliters ÷ 29.5735295625

The US fluid ounce is defined as exactly 29.5735295625 ml by international agreement. This is not a rounded value — it is the exact legal definition used in all US customary measurement calculations.

Oz to ML Conversion Table

Fluid Ounces (fl oz)Milliliters (ml)Common Reference
1 fl oz29.574 mlshot glass
2 fl oz59.147 ml—
4 fl oz118.294 ml½ cup
8 fl oz236.588 ml1 cup
12 fl oz354.882 mlsoda can
16 fl oz473.176 ml1 pint / standard bottle
20 fl oz591.471 mlvending machine bottle
24 fl oz709.765 mlsport bottle
32 fl oz946.353 ml1 quart / Nalgene
64 fl oz1,892.706 mlhalf gallon
128 fl oz3,785.412 ml1 gallon

Kitchen shortcut: 30 ml is a reliable approximation for 1 fl oz in everyday cooking. For pharmaceutical or scientific use, always use the exact value: 29.5735 ml. The difference of 0.4 ml per ounce compounds over larger volumes — 10 oz is 295.74 ml, not 300 ml.

Frequently Asked Questions

How many ml is 1 oz?
+
1 US fluid ounce equals exactly 29.5735295625 milliliters. In practice, 29.57 ml or 30 ml are used as working approximations for cooking.
How many ml is 8 oz?
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8 fluid ounces (1 US cup) equals 236.588 ml. Most measuring cups show both the cup and ml markings to four significant figures.
How many ml is 16 oz?
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16 fluid ounces (1 pint) equals 473.176 ml. A standard 16.9 oz water bottle holds 500 ml — slightly more than 16 fl oz.
Is 1 oz the same as 30 ml?
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Not exactly. 1 US fluid ounce is 29.5735 ml. The 30 ml rounding is common in recipes and medicine labels, but introduces a 1.4% error that can matter in precise baking or pharmaceutical dosing.
How many ml is 32 oz?
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32 fluid ounces (1 US quart) equals 946.353 ml — just under 1 liter. Use our oz to liter converter if you need the result in liters.
Does the UK fluid ounce use the same ml value?
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No. A UK imperial fluid ounce equals 28.4131 ml — about 1.16 ml less than the US fluid ounce. This page uses the US definition throughout. Always check which system a recipe uses before converting.
How many ml is 64 oz?
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64 fl oz equals 1,892.706 ml (≈ 1.893 liters). This is a common daily hydration target — see our daily water intake guide for context.

The exact conversion factor of 29.5735295625 ml per fluid ounce is established by the National Institute of Standards and Technology (NIST).

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