Oz to mL Calculator

Converting fluid ounces to milliliters comes down to knowing which ounce you're working with. In the United States, 1 fluid ounce equals 29.5735 mL. If you're working with Imperial measurements, 1 fluid ounce equals 28.4131 mL.

For most everyday purposes, especially cooking and recipes, you can round these to 29.57 mL (US) and 28.41 mL (Imperial) without any meaningful loss of accuracy. Medical dosages are a different story; those usually call for more precision.

The process itself is simple: take your ounce value and multiply it by the appropriate conversion factor. That's really all there is to it.

The US fluid ounce is the standard in American recipes, nutrition labels, and over-the-counter medicine. When a recipe calls for 8 oz of broth or a bottle says it contains 16 fl oz, those are US fluid ounces.

To convert US fluid ounces to mL, multiply by 29.5735. A few quick examples:

• 1 US fl oz = 29.57 mL
• 4 US fl oz = 118.29 mL
• 8 US fl oz = 236.59 mL
• 16 US fl oz = 473.18 mL
• 32 US fl oz = 946.35 mL

If you're going the other direction and converting mL back to US fluid ounces, divide your mL value by 29.5735.

The Imperial fluid ounce is used in the United Kingdom, Canada, and several other countries that follow British measurement standards. It's a touch smaller than the US version: 1 Imperial fl oz = 28.4131 mL.

That difference might not seem like much on a single ounce, but it adds up. A 20 Imperial fl oz pint (which is the standard pint in the UK) works out to about 568 mL, while a 16 US fl oz pint is only about 473 mL. If you're using a British cookbook in an American kitchen without adjusting, you could end up noticeably off on liquid measurements.

Some common Imperial oz to mL conversions:

• 1 Imperial fl oz = 28.41 mL
• 4 Imperial fl oz = 113.65 mL
• 8 Imperial fl oz = 227.30 mL
• 20 Imperial fl oz = 568.26 mL

The formula is straightforward multiplication. The only variable is which fluid ounce standard you're using. Here's a clean breakdown of both formulas so you can reference them quickly.

Sometimes you just want a quick reference without doing any math. The chart sections below cover the most common values you'll run into, from everyday cooking amounts to larger volumes.

Going from milliliters back to fluid ounces is just as easy. Divide your mL value by the conversion factor for whichever ounce standard you need.

• mL to US fl oz: divide by 29.5735
• mL to Imperial fl oz: divide by 28.4131

So if a European product lists a volume as 500 mL and you want to know how many US fluid ounces that is: 500 ÷ 29.5735 = 16.91 US fl oz. That's just a hair over a US pint.

A 750 mL wine bottle? That works out to about 25.36 US fl oz, or roughly 3 cups plus a little extra. Useful to know when you're scaling a recipe that calls for a full bottle.

Real-world examples make the math click faster than formulas alone. Here are a few practical scenarios:

1. Coffee drink: A 12 oz iced coffee is 12 × 29.5735 = 354.88 mL. Most standard travel mugs are 350-400 mL, so a 12 oz pour fills one nearly perfectly.
2. Baby formula: A recipe calls for 4 oz of water. That's 4 × 29.5735 = 118.29 mL. Most baby bottles have mL markings, so knowing this makes measuring straightforward.
3. Cocktail recipe: A cocktail calls for 1.5 oz of spirits. That's 1.5 × 29.5735 = 44.36 mL, which is a standard shot and a half.
4. Skincare product: A face serum bottle says 1 fl oz. That's just under 30 mL, which matches how most skincare serums are labeled in European markets.
5. British recipe: A UK sauce recipe calls for 5 Imperial fl oz of stock. Using the Imperial formula: 5 × 28.4131 = 142.07 mL, not the 147.87 mL you'd get using the US formula by mistake.

Cooking across different measurement systems can get confusing fast, especially when you're adapting recipes from different countries or using a kitchen scale versus measuring cups. A few things help smooth that out.

Most American recipes use volume measurements (cups, tablespoons, fluid ounces) rather than weight. European and professional recipes often use grams and milliliters. If you're converting a European recipe, your best bet is to use mL directly on a liquid measuring cup rather than trying to convert to cups first.

For dry ingredients, fluid ounce conversions don't apply. Flour, sugar, and similar ingredients should be measured by weight (grams or ounces by weight) rather than volume when precision matters, especially in baking.

A digital kitchen scale and a liquid measuring cup with both mL and cup markings will cover you in almost any situation. When a recipe calls for small amounts like a teaspoon or tablespoon, you don't need to convert at all; standard measuring spoons work universally.

Liquid medicine dosages in the US are commonly given in teaspoons, tablespoons, or milliliters. Knowing how these relate to fluid ounces can matter, especially when you're working with a syringe or dosing cup that only shows one unit.

• 5 mL = 1 teaspoon (the standard medical teaspoon)
• 15 mL = 1 tablespoon
• 30 mL ≈ 1 US fl oz

If a label says to take 0.5 fl oz of a liquid medication, that's roughly 14.79 mL. For anything close to 15 mL, a standard tablespoon measure works fine. For precise pediatric doses, always use the dosing syringe that comes with the medication; household spoons vary in actual volume and aren't reliable for medicine.

Over-the-counter products sold in the US typically use mL on dosing instructions now, partly because it reduces confusion and dosing errors. If you're buying medication while traveling internationally and need to convert the dosage, use the US fl oz formula (multiply oz by 29.5735 or divide mL by 29.5735) and double-check with a pharmacist when the dose is critical.

This is one of those things that trips people up more than it should. The US and Imperial fluid ounces both go by the same name but they're not interchangeable.

The US fluid ounce is actually slightly larger than the Imperial one. This surprises a lot of people since the US gallon is smaller than the Imperial gallon; the difference comes from how the two systems define their base units.

In practice, for most casual cooking the difference between the two is small enough that it won't ruin a dish. But for baking, large-volume recipes, or anything where liquid ratios matter, using the wrong formula can throw things off noticeably. When in doubt, check where the recipe originates.

Fluid ounces and milliliters each have their natural home. In the US, fluid ounces dominate product labels, recipes, and casual conversation about liquid volumes. Milliliters show up in medical contexts, scientific settings, and on products imported from or sold in metric-using countries.

If you're cooking from an American cookbook, sticking with fluid ounces and standard measuring cups works perfectly well. If you're following a recipe from a European site, measuring directly in mL is often simpler than converting to cups. Most liquid measuring cups sold in the US show both scales on the same side.

For medicine and supplements, mL is the more precise and universally understood unit. Pharmacists, pediatricians, and international health guidelines all use mL because the numbers are consistent regardless of country.

Science, chemistry, and any kind of lab work use mL exclusively. Fluid ounces don't appear in those contexts. And if you're traveling internationally and need to buy or measure liquids abroad, knowing your mL equivalents saves a lot of guesswork at the store or pharmacy.