Convert US fluid ounces to milliliters easily.
1 fl oz x 29.5735 = 29.5735 mL
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Ever tried making a British cake recipe only to find it calls for milliliters instead of the fluid ounces you’re used to? Or maybe you’ve stared at a medication label wondering how 2 fl oz translates to metric? That’s where our US fluid ounces to milliliters converter becomes your kitchen or lab sidekick. Let’s face it—unit confusion is the uninvited guest at every international cooking party. But with a 1:29.5735 conversion ratio (more on that later), you’ll be swapping units like a pro.
Unit definitions
What is a US fluid ounce (fl oz)?
A US fluid ounce measures volume in the United States customary system. You’ll see it on beverage cans, perfume bottles, and cooking recipes. Its symbol? fl oz. Fun fact: it’s technically 1/128th of a US gallon. But don’t worry—nobody expects you to visualize 1/128th of anything.
What is a milliliter (mL)?
The milliliter, abbreviated mL, is the metric system’s answer to small liquid measurements. Equal to 1/1000th of a liter, it’s used worldwide for everything from medication doses to cocktail recipes. Bonus points: it’s the same volume as a cubic centimeter. Science!
Conversion formula
Here’s the golden ratio:
1 US fluid ounce = 29.5735 milliliters
To convert any amount:
Milliliters = US fluid ounces × 29.5735
Going the other way?
US fluid ounces = Milliliters ÷ 29.5735
Example calculations
- Converting 12 fl oz to mL
12 × 29.5735 = 354.882 mL
(Rounded to 355 mL—the exact volume of a standard soda can!) - Converting 50 mL to fl oz
50 ÷ 29.5735 ≈ 1.69 fl oz
(That’s roughly a shot glass plus a splash.)
Conversion tables
US fluid ounces to milliliters
| US fl oz | Milliliters |
|---|---|
| 1 | 29.57 |
| 2 | 59.15 |
| 3 | 88.72 |
| 4 | 118.29 |
| 5 | 147.87 |
| 6 | 177.44 |
| 7 | 207.01 |
| 8 | 236.59 |
| 9 | 266.16 |
| 10 | 295.74 |
Milliliters to US fluid ounces
| Milliliters | US fl oz |
|---|---|
| 50 | 1.69 |
| 100 | 3.38 |
| 150 | 5.07 |
| 200 | 6.76 |
| 250 | 8.45 |
| 300 | 10.14 |
| 350 | 11.83 |
| 400 | 13.53 |
| 450 | 15.22 |
| 500 | 16.91 |
Historical background
The US fluid ounce has roots in the 18 th century British wine gallon. After independence, the US kept the system but tweaked it—because why make things simple? Meanwhile, France introduced the metric system in 1795, giving birth to the milliliter. Today, only three countries (US, Liberia, Myanmar) haven’t fully adopted metric. Talk about being fashionably late to the party!
Interesting facts?
- Bottle sizes lie
That “12 fl oz” beer can? It’s actually 355 mL, not 354.882. Companies round up for neat labeling. - Medical precision
Hospitals use milliliters exclusively. A wrong ounce-to-mL conversion could mean the difference between Tylenol and trouble. - Cocktail chaos
A “double” in Europe (50 mL) is 1.69 US fl oz. But in US bars, a double is often 2 fl oz (59 mL). Metric mixology matters! - NASA uses metric
After a 1999 Mars orbiter crash due to unit confusion, NASA switched fully to metric. Even rocket scientists need converters sometimes. - The ounce identity crisis
Fluid ounces measure volume, avoirdupois ounces measure weight. They’re not interchangeable—10 fl oz of water ≠ 10 oz by weight!
FAQ
Milliliters are the standard unit in most countries, while US fluid ounces are primarily used in the United States. Converting helps ensure accuracy in international recipes, scientific work, or product labeling.
One US fluid ounce equals approximately 29.5735 milliliters. For everyday use, people often round it to 30 mL.
A UK fluid ounce (Imperial) is slightly larger—about 28.413 mL compared to the US fluid ounce's 29.5735 mL. This matters in precise measurements like pharmacy dosages.
Almost! 8 US fl oz equals roughly 236.588 mL. Many beverage companies round this to 240 mL or 250 mL for simplicity, but it's not exact.
You'll see it in cooking (especially with imported recipes), cosmetics (product volumes), bartending (cocktail measurements), and medical contexts (liquid medications).