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Free Fluid Ounces (US) to Milliliters Converter

One US fluid ounce is 29.5735296 milliliters—essential for understanding bottle sizes, dosing cosmetics and perfume, measuring drinks, and following recipes with precision.

1 fl oz = 29.574 mL

Pick any units and edit either box — it converts instantly in your browser.

Quick answer

One US fluid ounce equals 29.57 milliliters. Multiply fl oz by 29.57 for mL. A UK fluid ounce is smaller at 28.41 mL, so always check the country of origin.

Formula & method

milliliters = fluid ounces (us) × 29.5735296
  • fl oz — value in fluid ounces (us)
  • mL — result in milliliters
  • 29.5735296 — exact conversion factor (1 fl oz = 29.5735296 mL)

To convert back, divide by 29.5735296 (1 mL = 0.033814 fl oz).

Fluid Ounces (US) to Milliliters — common values

Fluid Ounces (US) (fl oz)Milliliters (mL)
1 fl oz29.574 mL
2 fl oz59.147 mL
4 fl oz118.294 mL
6 fl oz177.441 mL
8 fl oz236.588 mL
12 fl oz354.882 mL
16 fl oz473.176 mL
32 fl oz946.353 mL

Examples

Example 1: A shot of spirits
Input
1 fl oz
Result
29.574 mL
Why
Standard 1 fl oz pour at a bar
Example 2: A cup of juice or water
Input
8 fl oz
Result
236.588 mL
Why
8 fl oz is a standard serving size on drink labels
Example 3: A pint of beer or a large water bottle
Input
16 fl oz
Result
473.176 mL
Why
Common single-serve beverage size in the US
Example 4: A travel bottle of perfume or face lotion
Input
2 fl oz
Result
59.147 mL
Why
Small cosmetic or fragrance sample or mini bottle

Common mistakes

  • Mixing up unit definitions — US fluid ounce = 29.57 mL; a UK fluid ounce is 28.41 mL.
  • Rounding too early. Multiply by the full factor (29.5735296) first, then round only the final milliliters value.
  • Converting the wrong way. This page goes Fluid Ounces (US) → Milliliters; to go back, divide by 29.5735296.

Frequently asked questions

Is a fluid ounce the same as a weight ounce?

No. A fluid ounce (fl oz) is volume; a weight ounce (oz) is mass. They're named similarly but measure different things. Check the label: 'fl oz' = volume, 'oz' = weight.

Why is a US fluid ounce different from a UK fluid ounce?

A US fluid ounce is 29.57 mL; a UK (imperial) fluid ounce is 28.41 mL. This stems from the different gallon definitions. For cosmetics and medicine, always check the label's country of origin.

How many fluid ounces are in a cup?

Exactly 8 US fluid ounces equal 1 US cup (8 × 29.57 = 236.6 mL). This is a fundamental cooking conversion.

What does 'Fl Oz' on a drink bottle mean?

It means the bottle holds that many US fluid ounces of liquid. A 20 fl oz bottle = 591 mL; a 2-liter bottle ≈ 67.6 fl oz. Most soft drinks come in 12, 16, 20, or 64 fl oz sizes.

How should I measure liquids for a recipe—by weight or volume?

For liquids like water, milk, and oil, volume (mL or fl oz) and weight (grams) are nearly the same because their density is close to 1 g/mL. For accuracy, use a scale in grams if you have one.

Why do cosmetics use different measurements than food?

Cosmetics and perfume often use fl oz because they're imported or have international labeling. Always check whether a bottle says 'fl oz' (volume) or 'oz' (weight). Fragrance is usually measured in mL for consistency.

Sources & references

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Provided “as is” for general information only — results may be inaccurate, so verify before you rely on them. No warranty; use at your own risk.

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