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US fluid ounces to Millilitres Converter

Enter a value in us fluid ounces to convert it to millilitres, litres.

How it is calculated

The tool converts US fluid ounces using the exact definition 1 US fl oz = 29.5735296 mL. So mL = fl oz × 29.5735296 and L = fl oz × 0.0295735296. The input fl oz is a volume in US fluid ounces; millilitres are shown to two decimals and litres to four. The UK (imperial) fluid ounce is about 28.41 mL, so a recipe or label written for UK measures will give a result roughly 4% too high here. Fluid ounces measure volume, so this is unrelated to the ounce of weight (about 28.35 g), and the conversion works the same for water, oil or any other liquid. Negative values are converted without any limit.

Worked example

A US drink can is labelled 12 fl oz. Millilitres: 12 × 29.5735296 = 354.8823552, shown as 354.88 mL. Litres: 12 × 0.0295735296 = 0.3548823552, shown as 0.3549 L. So six such cans hold about 2.13 litres in total (6 × 354.88 mL = 2,129.29 mL), which is useful when checking how many fit in a 2-litre bottle's worth of drink.

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Common mistakes

  • Using the US figure for a UK (imperial) measure. A UK fluid ounce is smaller, so a British recipe's "10 fl oz" is not 295.7 mL.
  • Treating fluid ounces as weight. 12 fl oz is a volume; it does not weigh 12 ounces unless the liquid happens to have the right density.
  • Rounding 29.5735 to 30 or 29 for quick maths on larger quantities. The error grows with the amount: for 128 fl oz, using 30 gives 3,840 mL instead of 3,785.41 mL.
  • Reading the litre figure as millilitres, or the other way round. 0.3549 L is the same amount as 354.88 mL.

About this calculator

The US fluid ounce equals exactly 29.5735 millilitres (1/128 of a US gallon), and it's a volume measurement, not weight — distinct from the UK/imperial fluid ounce, which is smaller at 28.4131 mL because the imperial gallon is defined differently. This is why a US "16 fl oz" bottle and a UK "16 fl oz" bottle don't actually hold the same amount of liquid.

Cooks following American recipes, bartenders measuring spirits, and beverage and cosmetics manufacturers labeling US-market packaging convert fluid ounces to millilitres constantly, since most of the world's measuring equipment, recipes, and regulatory labeling requirements are metric.

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