Convert milliliters to US fluid ounces — and back — using the exact definition
(1 fl oz = 29.5735295625 mL). Loads with mL → fl oz preselected. (Weight ounces for dry
ingredients are a different unit — that’s the
grams to ounces converter.)
The formula
fl oz = mL ÷ 29.5735295625 · mL = fl oz × 29.5735295625. Kitchen shorthand of “30 mL
per ounce” runs 1.4% small — harmless in a marinade, noticeable in a cocktail.
Common values
mL
fl oz
mL
fl oz
5
0.17
250
8.45
15
0.51
330
11.16
30
1.01
355
12.00
44
1.49
500
16.91
100
3.38
750
25.36
150
5.07
1,000
33.81
Toiletries, drinks, doses
The 100 mL / 3.4 oz airport rule is this page’s most-asked question — settled in the FAQ.
Drinks: bottle and can sizes cross the Atlantic constantly (750 mL wine = 25.4 oz, 330 vs
355 mL cans). Recipes: US liquid lines come in fluid ounces and cups (8 fl oz = 236.6 mL);
note that 5 mL = a metric teaspoon while the US teaspoon is 4.93 mL — pharmacy dosing spoons
use the flat 5. Larger liquid jobs (fuel, tanks) step up to the
liters to gallons converter, where the US/UK gallon split
matters.
Private by design
Converted on your device as you type — no requests, no storage. Six categories of units live
in the unit converter.
Last updated:
Frequently asked questions
What is the exact ml to fluid oz formula?
Divide milliliters by 29.5735295625 — the exact US fluid ounce, derived from the 231-cubic-inch gallon. So 100 mL = 3.38 fl oz. Reverse: fl oz × 29.5735295625. (A UK fluid ounce is 28.4131 mL — 4% smaller; this page uses US.)
Why do travel bottles say both 100 mL and 3.4 oz?
Airport liquid rules are written as 100 mL; 100 ÷ 29.5735 = 3.381, which packaging rounds to 3.4 oz. Both numbers on the label describe the same bottle — a "3.4 oz" toiletry is exactly at the limit, not over it.
Is a fluid ounce the same as a weight ounce?
No — fluid ounces measure volume, weight ounces measure mass, and they only coincide (roughly) for water: 1 fl oz of water weighs about 1.043 oz. For honey, oil, or flour the two diverge sharply. Liquid recipe lines want THIS converter; dry-weight lines want grams to ounces.
What are common drink sizes in both units?
A standard wine pour of 150 mL is 5.1 fl oz (a 750 mL bottle = 25.4 fl oz); a US shot is 44 mL = 1.5 fl oz; a soda can of 355 mL is 12 fl oz; the European 330 mL can is 11.2 fl oz; a "cup" in US recipes is 8 fl oz = 236.6 mL.
Convert length, weight, temperature, volume, area, and speed between 46 units using exact international definitions — instantly, with the formula shown.
Convert liters to US gallons (and back) with the exact 3.785411784 definition — fuel, tanks, and aquariums, with the UK imperial gallon handled honestly.