Fluid Ounces to Milliliters Converter

1. Type the amount. The box starts in fluid ounces.
2. Pick US fl oz for US recipes and labels, or UK fl oz for British ones.
3. To go from milliliters to ounces, tap mL to fl oz. Then type the amount in milliliters.
4. Read the answer plus liters, cups, tablespoons and teaspoons.

A fluid ounce (fl oz) measures volume, the space a liquid takes up. It is used on US drink labels, recipes and baby bottles.

There are two kinds. A US fluid ounce is 29.57 mL. A UK (imperial) fluid ounce is 28.41 mL, about 4 percent smaller. A milliliter (mL) is one thousandth of a liter, the metric unit most of the world uses.

A fluid ounce is not the same as an ounce of weight. An ounce of weight (oz) measures how heavy something is, not how much space it fills.

Where:

• 29.5735295625 = mL in one US fluid ounce (exact, from 1/128 of a 231 cubic inch gallon)
• 28.4130625 = mL in one UK fluid ounce (exact, 1/160 of an imperial gallon)

Quick mental math: multiply fluid ounces by 30. It is a little high, but nutrition labels in the US use 30 mL per fl oz for this reason.

US fluid ounces, rounded to two decimals.

Going the other way often? Use the mL to fl oz converter.

There are 16 cups in a US gallon. A gallon is also 4 quarts, 8 pints and 128 fluid ounces.

For more kitchen conversions, see how many cups are in a gallon. A UK (imperial) gallon is bigger: 160 UK fl oz, or 4.55 liters. For big volumes, use the gallons to liters converter.

Because UK pints and gallons hold more ounces, a UK pint (568 mL) is about 20 percent bigger than a US pint (473 mL).

US or UK Ounces

The 4 percent gap adds up. 20 fl oz is 591 mL in US units but 568 mL in UK units.

Label Rounding

US nutrition labels round 1 fl oz to 30 mL, so a "12 fl oz (355 mL)" can may also be shown as 360 mL.

Weight vs Volume

8 oz of flour by weight is not 8 fl oz by volume. Only water comes close to 1 oz weight per fl oz.

Cooking and Baking

Turn US recipe amounts into metric jugs and back.

Drinks and Bottles

Compare a 16.9 fl oz bottle with a 500 mL one, or count how much water you drink.

Baby Bottles

Bottles are often marked in both fl oz and mL.

Travel Liquids

The 3.4 fl oz carry-on limit is 100 mL.

1. Mixing Weight Ounces and Fluid Ounces

Fluid ounces measure space. Use a scale for weight ounces.

2. Using US Factors for a UK Recipe

Pick UK fl oz for British recipes and pub measures.

3. Rounding to 30 for Large Amounts

30 mL per fl oz is fine for a cup, but on a gallon it is off by about 55 mL.

4. Thinking a Cup Is Always 250 ML

A US cup is 236.6 mL. A metric cup is 250 mL. Check which one a recipe uses.

Both factors are exact by law, so the math is exact. Only the display is rounded.

One US fluid ounce is 29.57 mL. One UK fluid ounce is 28.41 mL.

Multiply the fluid ounces by 29.5735. For example, 4 fl oz x 29.5735 = 118.3 mL.

8 US fluid ounces is 236.6 mL, which is one US cup.

A 12 fl oz can holds 354.9 mL. Labels usually round it to 355 mL.

There are 16 cups in a US gallon. A gallon is also 4 quarts, 8 pints or 128 fluid ounces.

A US gallon has 128 fluid ounces. A UK gallon has 160 UK fluid ounces.

Yes. 500 mL is 16.91 US fluid ounces, so a 16.9 fl oz bottle is a 500 mL bottle.

Almost. One US fluid ounce of water weighs about 1.04 ounces (29.6 g). Oil weighs less and honey weighs more.

3.4 fl oz is about 100 mL, the carry-on liquid limit used by most airports.

US labeling rules round 1 fl oz to 30 mL to keep labels simple. The exact value is 29.57 mL.

• Unit conversion (US National Institute of Standards and Technology).
• NIST Handbook 44 (NIST; US customary unit definitions).
• 21 CFR 101.9 Nutrition labeling of food (US eCFR; label rounding of 1 fl oz to 30 mL).
• The Units of Measurement Regulations 1995 (UK legislation; imperial units).