How Many mL in an Oz? Exact Ounce to Milliliter Conversion Guide 2026

One fluid ounce equals 29.5735 milliliters, exactly. That single number settles kitchen arguments, skincare label confusion, and drink-pour debates across the United States every day.

This guide gives you the exact oz to mL formula, a quick-reference chart, and what those numbers actually look like in the bottles and cups you use.

After reading this blog post you will able to answer this question How Many mL in an Oz?

How Many mL in an Oz? The Exact Formula

One US fluid ounce equals 29.5735 milliliters. The precise figure, as defined by the National Institute of Standards and Technology, is 29.5735295625 mL, since a US fluid ounce is fixed at exactly 1/128 of a US gallon.

The formula is simple:

mL = oz × 29.5735

So 4 oz works out to 4 × 29.5735 = 118.29 mL. Double it to 8 oz and you get 236.59 mL, the volume of a standard US measuring cup.

Cooks often round this to 30 mL for convenience, and that rounding is not casual guesswork. The FDA’s nutrition labeling guidelines fix one fluid ounce at exactly 30 mL for food labels, which is why a “1 oz” serving size on packaging never quite matches the lab-precise 29.5735 mL figure.

Oz to mL Conversion Chart for Common Amounts

Use this oz to mL chart for the amounts that come up most in recipes and product labels.

Fluid Ounces (oz)	Milliliters (mL)
1 oz	29.57 mL
2 oz	59.15 mL
4 oz	118.29 mL
6 oz	177.44 mL
8 oz (1 cup)	236.59 mL
12 oz	354.88 mL
16 oz (1 pint)	473.18 mL

A few anchor points make mental math easier: 1 tablespoon is roughly 14.79 mL, or half a fluid ounce, and 1 US cup is always 8 fl oz, no exceptions in the customary system.

mL to Oz in Real Life: What Common Sizes Actually Look Like

Numbers stick better when they’re tied to something you’ve held. Here’s how many ounces in mL translates to everyday items.

A 50 mL travel bottle holds about 1.69 oz, not 2 oz, a gap that trips up a lot of skincare shoppers. A standard US bottled water labeled 16.9 oz is essentially 500 mL, rounded for shelf labeling. 16 fl oz equals 473.18 mL, which is exactly one US pint or two full cups. A standard 1.5 oz liquor shot comes out to about 44.4 mL.

For context on scale, the CDC reports that US adults consume an average of 117 oz of total water per day for men and 93 oz for women, counting all beverages and food. A single 16 oz glass is a modest slice of that daily total, not an outsized pour.

Fluid Oz vs Dry Oz vs Imperial Oz: Why Numbers Don’t Match

Fluid ounces measure volume. Regular ounces measure weight. A fluid ounce of water happens to weigh close to one weight ounce (28.35 grams), but that’s a coincidence of water’s density, not a rule that holds for honey, flour, or oil.

There’s also a transatlantic mismatch. The US fluid ounce (29.5735 mL) is about 4% larger than the Imperial or UK fluid ounce (28.4131 mL), according to Wikipedia’s sourced breakdown of fluid ounce standards. A British recipe and an American recipe using “1 oz” are not describing the same splash of liquid.

For US recipes, US nutrition labels, and US pharmacy measurements, the rule of thumb is straightforward: use 29.5735 mL per fluid ounce, and treat the 30 mL figure as a labeling shortcut, not the scientific standard.

FAQs

Does 1 oz equal 30 mL?

Not exactly. 1 fl oz equals 29.5735 mL, but US food labels round it up to a flat 30 mL for simplicity. The 30 mL figure is a labeling convention, not the precise conversion.

How many mL is 1 oz?

1 fluid ounce is 29.5735 mL, derived from the US gallon standard (231 cubic inches divided by 128). For everyday kitchen use, rounding to 29.57 mL is plenty accurate.

How much is 2oz in mL?

2 fl oz equals 59.15 mL. Just double the single-ounce figure: 2 × 29.5735 = 59.147 mL, commonly rounded to 59 mL on labels and recipe cards.

Does 50 mL equal 1 oz?

No. 50 mL equals about 1.69 fl oz, not 1 oz. One fluid ounce is 29.5735 mL, so 50 mL is roughly 70% more liquid than a single ounce.

Is 50ml the same as 2 oz?

No. 2 oz equals 59.15 mL, about 9 mL more than 50 mL. A 50 mL bottle is closer to 1.7 oz, a common source of confusion on travel-size cosmetics.

Is 16 oz a lot?

16 oz equals one US pint (473.18 mL), or two full cups. It’s a standard water bottle and soda can size, and per CDC data, it’s a fraction of the 93 to 117 oz adults typically consume across a full day.