Oz to ML Converter

The Oz to ML Converter turns fluid ounces (fl oz) into milliliters (mL) — and answers the question every other converter glosses over: is one ounce really 30 mL? Instead of a single number, this dedicated page shows all three readings at once — the US ounce (29.5735 mL), the UK / Imperial ounce (28.4131 mL), and the rounded label / bartending ounce (exactly 30 mL). It accepts fractions like 1 1/2 oz, recognizes everyday sizes such as shots, baby-bottle feeds and perfume bottles, and shows an animated graduated beaker so the amount is easy to picture.

How to Convert Fluid Ounces to Milliliters

Converting fluid ounces to milliliters is a single multiplication. The only twist is that there is more than one definition of a "fluid ounce", so the multiplier changes depending on which one you mean.

To go the other way — from milliliters back to fluid ounces — divide instead: divide by 29.5735 for US ounces, or by 28.4131 for UK ounces.

Is 1 oz Exactly 30 mL?

Almost, but not quite. A true US fluid ounce is 29.5735 mL and a UK (Imperial) fluid ounce is 28.4131 mL. The familiar "1 oz = 30 mL" comes from a deliberate rounding: the US FDA uses 30 mL per fluid ounce for nutrition labeling, and bartenders, pharmacists and perfume makers pour and size in round metric numbers. So a bottle labeled "1 fl oz" almost always holds 30 mL, even though the strict conversion is 29.57 mL. This converter shows the exact US and UK values next to the rounded 30 mL value so you can choose the one that matches your context.

US vs UK Fluid Ounces: Why Three Answers?

The US ounce is about 4% larger than the UK ounce, so the same number of ounces converts to slightly more millilitres in the US system. The label ounce sits just above both. For most everyday tasks the difference is tiny, but it matters for medicine dosing, lab work and precise recipes — which is exactly why seeing all three at once is useful.

Common Oz to mL Conversions

Oz to mL for Bartending and Cocktails

Cocktail recipes are written in ounces, often as fractions, but jiggers and metric bar spoons are marked in millilitres. This tool takes fractional ounce inputs directly:

• 1/2 oz = 15 mL (rounded) — a "pony" pour.
• 3/4 oz = 22 mL — a common modifier measure.
• 1 oz = 30 mL — the standard metric single pour.
• 1 1/2 oz = 45 mL — the classic US shot / base spirit.
• 2 oz = 60 mL — a strong single or double.

Oz to mL for Baby Feeding, Perfume and Medicine

The conversion shows up constantly outside the kitchen:

• Baby bottles — feeds are given in ounces in the US but bottles are marked in mL elsewhere: 2 oz ≈ 60 mL, 4 oz ≈ 120 mL, 6 oz ≈ 180 mL, 8 oz ≈ 240 mL (using the 30 mL feeding ounce).
• Perfume and fragrance — bottles are sized in round mL and labeled in ounces: 1 oz = 30 mL, 1.7 oz = 50 mL, 3.4 oz = 100 mL.
• Medicine dosing — a dose cup ounce is 30 mL, and 1 teaspoon = 5 mL, 1 tablespoon = 15 mL.

How to Use This Converter

1. Choose the direction: keep the default fl oz to mL, or switch to mL to fl oz for the reverse.
2. Enter the amount: type the fluid ounces, for example 1.5. Fractions such as 1 1/2, 3/4 or ½ are accepted.
3. Click Convert: the tool calculates instantly.
4. Read the result: see the US, UK and label 30 mL values side by side, the shot / tablespoon / cup equivalents, the recognized real-world size, and the animated graduated beaker, plus a step-by-step breakdown.

Frequently Asked Questions

How many mL is 1 fluid ounce?

One US fluid ounce is 29.5735 mL and one UK (Imperial) fluid ounce is 28.4131 mL. On food labels and behind the bar a fluid ounce is rounded to exactly 30 mL, so all three answers are close but not identical.

Is 1 oz exactly 30 mL?

Not exactly. A true US fluid ounce is 29.5735 mL, so 30 mL is a rounded value. The US FDA uses 30 mL per fluid ounce for nutrition labeling and bartenders pour 30 mL as one ounce, which is where the popular 1 oz = 30 mL figure comes from.

How do I convert 8 oz to mL?

Multiply 8 by 29.5735 to get about 236.6 mL for US fluid ounces, or by 28.4131 to get about 227.3 mL for UK fluid ounces. Using the label value of 30 mL gives 240 mL, which is why an 8 oz cup is often called 240 mL.

What is the difference between US and UK fluid ounces?

A US fluid ounce is 29.5735 mL while a UK (Imperial) fluid ounce is 28.4131 mL, so a US ounce is about 4 percent larger. The same number of ounces therefore converts to slightly more millilitres in the US system.

How many mL is a shot?

A standard US shot is 1.5 fluid ounces, which is 44.36 mL using the exact US ounce or 45 mL using the rounded 30 mL per ounce bar measure. A single 1 oz pour is 30 mL.

How many mL in a perfume bottle labeled 1.7 oz?

A 1.7 fl oz perfume bottle holds 50 mL. Fragrance makers size bottles in round metric numbers such as 30, 50, 90 and 100 mL and print the nearest ounce figure, so 1.7 oz maps to 50 mL and 3.4 oz maps to 100 mL.

Additional Resources

• Fluid Ounce - Wikipedia
• Litre - Wikipedia