Convert Fluid ounces (fl oz) to Milliliters (mL)

The fl oz-to-mL formula

To convert fluid ounces to milliliters, multiply the fl oz value by 29.5735. One US fluid ounce is defined as 29.5735 mL. So 8 fl oz is 236.588 mL, exactly one US cup; 12 fl oz is 354.882 mL; and 16 fl oz (one pint) is 473.176 mL. That is why a typical 12 fl oz US soda can holds about 355 mL. Note that this is a volume unit, so do not confuse the fluid ounce with the weight ounce.

When you need this conversion

US drinks label their volume in fl oz, like 12 fl oz cans or 16 fl oz cups, so converting to mL makes the size click. When perfume or skincare reads '1.7 fl oz,' converting tells you it is about 50 mL. Bartenders measure whiskey or liqueur by the shot (about 1.5 fl oz ≈ 44 mL). If a US recipe lists liquids in fl oz, this conversion moves them onto a mL measuring cup. It also helps compare imported drinks and sauces against local products.

Reference points and a trap

Remember 1 fl oz ≈ 29.57 mL, or round to about 30 mL. It helps to know that 8 fl oz = 1 cup = 236.588 mL and 16 fl oz = 1 pint. The biggest trap is that the US and UK (imperial) fluid ounces differ. This calculator uses the US value of 29.5735 mL, while a UK fl oz is 28.4131 mL, about 4% smaller. It is also completely different from the weight ounce (about 28.35 g), so keep the two separate.

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