Conversion
Ounces to Milliliters
Convert US fluid ounces to milliliters instantly — type a value and watch it convert live, with the formula, the working shown step by step, and lookup charts for recipes, drinks, and dosing.
Convert fluid ounces to milliliters
fl oz ↔ mL× 29.5735295625
8 fl oz equals
236.59mL
fl oz
8
mL
236.59
per fl oz
29.5735295625
Edit either field — the other updates live.
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The basics
What does the conversion mean?
Fluid ounces and milliliters both measure liquid volume — they are just two different measuring cups for the same thing. The fluid ounce is the everyday volume unit in the US; the milliliter is the global metric standard. Converting between them is a single multiplication with one fixed factor.
1 fl oz = 29.57 mL
Milliliters are smaller
There are about thirty milliliters in one fluid ounce, so the milliliter figure is always the larger number. Switching from fluid ounces to milliliters means your number grows — roughly thirty times.
8 fl oz ≈ 236.59 mL
× 29.5735295625
One factor does it all
The exact multiplier is twenty-nine point five seven three five — there is no offset, no zero shift. Just multiply the fluid ounces by the factor and you have milliliters.
12 fl oz ≈ 354.88 mL
Method
How to convert fl oz to mL by hand
Three steps, one multiplication. The tricky part is just keeping the factor straight.
- 1
Write down the factor
One US fluid ounce equals 29.5735295625 mL. For everyday kitchen work, 29.57 or even 30 is fine. For medication or precision lab work, keep the full figure.
1 fl oz = 29.5735295625 mL - 2
Multiply the fluid ounces
Multiply your volume in fluid ounces by the factor. The result is the same volume expressed in milliliters — a larger number, since mL are smaller units.
8 × 29.5735295625 = 236.59 mL - 3
Sanity-check the direction
The mL figure should be about thirty times the fl oz figure. If the result came out smaller, you divided instead of multiplied — check that you ran the conversion the right way.
8 fl oz → 236.59 mL ✓
Quick chart
Fluid ounces to milliliters lookup table
Looking up “how many mL is X fl oz?” — here it is at a glance. Switch between common amounts, drink and container sizes, and the reverse mL-to-fl-oz direction.
fl oz
mL
0.5 fl oz
14.79 mL
1 fl oz
29.57 mL
1.5 fl oz
44.36 mL
2 fl oz
59.15 mL
3 fl oz
88.72 mL
4 fl oz
118.29 mL
5 fl oz
147.87 mL
6 fl oz
177.44 mL
8 fl oz
236.59 mL
10 fl oz
295.74 mL
12 fl oz
354.88 mL
16 fl oz
473.18 mL
20 fl oz
591.47 mL
32 fl oz
946.35 mL
64 fl oz
1892.71 mL
Where it shows up
When you actually need this
Three everyday situations where fl oz and mL collide — and getting the conversion right actually matters.
8 fl oz = 236.59 mL
Recipes & cocktails
US recipe books measure liquids in cups and fluid ounces; metric kitchen scales, European recipes, and bartending guides use milliliters. A standard US cup is eight fluid ounces, so a recipe calling for two cups means roughly four hundred seventy-three milliliters.
1 fl oz = 29.57 mL
Medicine & dosing syringes
Over-the-counter medicines in the US are often labeled in fluid ounces (the children's cough syrup “give one fl oz” instruction), while oral syringes and hospital dosing cups are marked in milliliters. Converting correctly is a patient-safety issue — off by even half a fluid ounce, and the dose is wrong by nearly fifteen milliliters.
3.4 fl oz = 100 mL
Product labels & travel bottles
Airport security restricts carry-on liquids to containers of one hundred milliliters or fewer — printed on most travel bottles as “3.4 fl oz.” Knowing this lets you quickly identify compliant sizes at a glance, and it explains the odd 3.4 fl oz labeling on cosmetic travel sets.
Reference
Common items in fl oz and mL
Volumes worth knowing by heart. Each is the real US measurement — converted with the same factor the tool uses above.
Item
fl oz
mL
Shot glass (US standard)
1.5
44.36
US cup
8
236.59
Soda can (US standard)
12
354.88
Pint glass
16
473.18
Bottle of water (US common)
20
591.47
Worth knowing
Facts and shortcuts worth remembering
A handful of landmarks that make fl oz ↔ mL conversion almost automatic.
≈ 30 mL
The thirty-mL rule
Rounding one fluid ounce to thirty milliliters gives you a quick mental estimate within about one and a half percent. Useful for cooking but not for medication, where you should always use the precise value.
5 fl oz × 30 ≈ 150 mL (true: 147.87 mL)
1 tbsp = ½ fl oz ≈ 14.79 mL
The tablespoon bridge
One tablespoon is half a fluid ounce, or about fourteen point eight milliliters. This links the imperial tablespoon directly to the milliliter scale — a useful bridge when recipes mix the two.
8 fl oz = 1 cup ≈ 236.59 mL
One cup
The US cup is exactly eight fluid ounces. Knowing this lets you convert cup-based recipes to metric without converting each ingredient individually — just multiply the cup count by two hundred thirty-six point six.
2 cups = 473.18 mL
12 fl oz ≈ 354.88 mL → 355 mL
Why cans say 355 mL
The US soda-can standard is twelve fluid ounces, which computes to almost exactly three hundred fifty-five milliliters. Countries that sell the same cans in metric labeling round up to 355 mL rather than printing the decimal.
Variants
US vs UK fluid ounce — and volume vs weight
The term “ounce” carries two completely different meanings depending on context — and even within volume, the US and UK versions differ. Here is what to watch for.
US fl oz = 29.5735 mL
US fluid ounce (this tool)
The US customary fluid ounce is defined as one hundred twenty-eighth of a US gallon (three point seven eight five four liters), giving exactly twenty-nine point five seven mL. This is the ounce used in US recipes, beverage cans, and over-the-counter medicine labels. This calculator uses the US definition.
UK fl oz = 28.4131 mL
UK imperial fluid ounce (different!)
The UK imperial fluid ounce is one twentieth of an imperial pint (five hundred sixty-eight mL), giving about twenty-eight point four mL — roughly four percent less than the US version. If your recipe or product comes from the UK, Ireland, or Australia, apply the UK factor instead.
fl oz ≠ oz (weight)
Fluid ounce vs avoirdupois ounce
A fluid ounce is a unit of volume; an avoirdupois ounce (the weight ounce) is about twenty-eight point three five grams. The two happen to be numerically close for water (since one mL of water weighs about one gram), but for any other liquid — oil, honey, cream — they diverge significantly. Never swap one for the other in a recipe.
fl oz of water ≈ g
When they accidentally match
For water specifically, one fluid ounce (≈ 29.57 mL) weighs about twenty-nine point six grams, which is close to one weight ounce (28.35 g). This near-coincidence misleads people into thinking the two ounces are interchangeable — they are not, except for water near room temperature.
Common mistakes
Where conversions go wrong
Three slips that produce a wrong answer — all easy to avoid once you know to look for them.
US ≠ UK fl oz
Using the wrong fluid ounce
US fl oz (≈ twenty-nine point six mL) and UK fl oz (≈ twenty-eight point four mL) differ by about four percent. A UK recipe read with a US conversion gives a cup of milk that is short by nearly twelve milliliters — noticeable in baking.
fl oz ≠ oz weight
Confusing volume with weight
Measuring one ounce of honey in a fluid-ounce jigger is not the same as weighing one ounce on a scale. Honey is denser than water, so the volumes and masses diverge. Use a kitchen scale when a recipe specifies weight ounces, and a measuring cup or jigger for fluid ounces.
30 mL ≠ 29.5735 mL
Over-relying on the 30 mL shortcut
Rounding one fl oz to thirty mL accumulates error. Over a twelve-ounce recipe that is nearly five milliliters off — fine for soup, significant for a medication dose. Always use the precise factor when accuracy matters.
FAQ
Common questions
One US fluid ounce equals exactly 29.5735295625 milliliters. This derives from the US gallon being defined as 3.785411784 liters, divided by 128 fluid ounces. In everyday kitchen math, people round to 30 mL, but for recipe scaling, medication, or lab work, the full precision matters.
Multiply the number of fluid ounces by 29.5735295625. For example, 8 fl oz × 29.5735295625 ≈ 236.59 mL — exactly one US cup. For quick mental math, multiply by 30 and you'll be within 1.5% of the exact answer.
No — they are close but not the same. One US fluid ounce is about 29.5735 mL, while one UK imperial fluid ounce is about 28.4131 mL, a difference of roughly 4%. This calculator uses the US fluid ounce. If your recipe or product label comes from the UK or Australia, the answer will be slightly off.
A fluid ounce measures volume (how much space a liquid occupies), while an avoirdupois ounce measures mass — about 28.35 grams. A fluid ounce of water happens to weigh close to a weight ounce, but for denser or lighter liquids (like oil, honey, or alcohol) the numbers diverge. Never substitute one for the other in a recipe.
12 fl oz × 29.5735295625 ≈ 354.88 mL, which is why soft-drink cans sold outside the US are labeled 355 mL. The 355 mL figure is the metric rounding of the US 12 fl oz standard.
A standard US shot is 1.5 fl oz, which is 1.5 × 29.5735295625 ≈ 44.36 mL. Some bartenders pour a 1 fl oz (≈ 29.57 mL) or 2 fl oz (≈ 59.15 mL) shot, so it pays to know the local convention.
Yes, for most everyday purposes. The true value is 29.5735 mL, so using 30 mL introduces an error of about 1.44%. That's fine for a cooking estimate but too imprecise for medication dosing or scientific work, where you should use the exact factor.
Airport security (TSA) limits liquids to 100 mL containers, which is about 3.38 fl oz — rounded up to 3.4 fl oz on most bottle labels. This is the standard carry-on liquid limit across most international airports.
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Ugo CharlesBuilt and fact-checked against our editorial standards · Last updated June 2026
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