mL to oz Converter
Enter milliliters and get fluid ounces using the exact definition 1 US fl oz = 29.5735295625 mL. A reverse row also converts the same number the other way (oz → mL).
Example: with Volume (mL) 500 · Ounce definition US fluid ounce (29.5735 mL) → Fluid ounces: 16.91 fl oz.
Computed by the calculator below using its default values. Change any input to see your own numbers.
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Check it outHow to convert ml to ounces
To convert ml to oz, divide milliliters by 29.5735 (the exact US fluid ounce). So 100 mL = 3.38 fl oz, a 355 mL soda can is 12 fl oz, a 500 mL bottle is 16.91 fl oz, and a 750 mL wine bottle is 25.36 fl oz. Going from milliliters to ounces always uses the same single division — there’s no density involved because both units measure volume.
The ml vs oz confusion usually comes from two things. First, the “ounce” on a kitchen scale is weight (28.35 g), not volume — this page converts to fluid ounces. Second, there are three ounce sizes: the US customary fl oz (29.5735 mL), the US nutrition-label ounce (exactly 30 mL, used on food packaging), and the UK imperial fl oz (28.4131 mL). Pick the right one in the dropdown; 500 mL is 16.91 US fl oz but 17.60 imperial fl oz.
How it’s calculated
Fluid ounces = milliliters ÷ 29.5735295625, the exact NIST definition of the US fluid ounce (1/128 of a 231 cubic-inch gallon). The dropdown swaps in 30 mL for the FDA nutrition-label ounce or 28.4130625 mL for the UK imperial fluid ounce. Cups use 1 US cup = 8 US fl oz = 236.5882365 mL; the reverse row multiplies your number by the same factor to go oz → mL.
Results update as you type and are estimates, not professional advice — verify important decisions with a qualified professional.
Common mistakes
- Mixing up fluid ounces (volume) with ounces by weight — a fl oz of oil weighs less than a fl oz of honey.
- Using the US factor for UK recipes: an imperial fl oz is 28.41 mL, so 500 mL is 17.60 imperial fl oz, not 16.91.
- Rounding 1 oz to 30 mL for medicine doses — that nutrition-label shortcut runs about 1.4% high.
Frequently asked questions
How many oz are in 100 ml?
100 ÷ 29.5735 = 3.38 US fluid ounces. For UK imperial ounces it's 100 ÷ 28.4131 = 3.52 fl oz.
Is 1 oz the same as 30 ml?
Not exactly. 1 US fluid ounce is 29.5735 mL; FDA nutrition labels round it to 30 mL for simplicity. The difference is about 1.4%.
What is the difference between ml and oz?
A milliliter is a metric volume unit; a fluid ounce is a US customary volume unit 29.5735 times larger. Neither measures weight — the weight ounce (28.35 g) is a separate unit.
How many oz is 750 ml?
750 ÷ 29.5735 = 25.36 US fl oz — the standard wine bottle. That's why wine labels in the US often say 25.4 fl oz.
How do I convert ml to fl oz in my head?
Divide by 30 for a quick estimate, then add about 1.4%. For 500 mL: 500 ÷ 30 ≈ 16.7, nudged up gives ≈ 16.9 fl oz.