Milliliters to Fluid Ounces

Milliliters and US fluid ounces

The milliliter is one thousandth of a liter, the same volume as one cubic centimeter. Medicine doses, cosmetics, small bottles and metric recipes are measured in milliliters.

The US fluid ounce is 1/128 of a US gallon: exactly 29.5735295625 milliliters. Drink cans and bottles, cosmetics and US recipes use fluid ounces. It measures volume, unlike the ounce of weight.

Worked example

Convert 500 mL: 500 × 0.0338140227 = 16.90701135, so 500 milliliters is 16.90701135 US fluid ounces. Likewise 100 mL = 3.38140227 fl oz.

Estimating in your head

Divide by 30 for a quick figure; it is off by about 1.4%. For 500 mL that gives 16.7 fl oz, against 16.907 exactly.

Going the other way

To convert US fluid ounces to milliliters, divide by 0.0338140227 (or multiply by 29.5735295625). The swap button between the boxes opens that page.

fl oz = mL × 0.0338140227

1 mL = 0.000001 m³ and 1 fl oz = 0.0000295735295625 m³, both by definition, so the factor is their ratio: 0.0338140227 (rounded here; the page uses the full value). Results drop binary floating-point noise beyond 15 significant digits and display at the precision you choose (6 significant figures by default). Copy result copies the full value.