mL to oz Converter - Free Online Tool

Convert milliliters to fluid ounces — US or UK — with kitchen context and ingredient support

Whether you are following a recipe, measuring medication, or comparing product labels, converting milliliters to fluid ounces is one of the most common unit conversions in everyday life. Our free mL to oz converter makes this effortless — simply enter your volume in milliliters and get the result in US fluid ounces, UK (Imperial) fluid ounces, or both at once. The metric system uses milliliters (mL) as the standard unit for small liquid volumes. One milliliter is exactly one-thousandth of a liter. Most countries that use the metric system measure cooking ingredients, medications, and beverages in milliliters. A standard teaspoon holds about 5 mL, a tablespoon is 15 mL, and a common drinking glass is roughly 250 mL. Fluid ounces, on the other hand, are used primarily in the United States and historically in the United Kingdom. The US fluid ounce equals 29.5735 mL — this is the version you'll find on US nutrition labels, beverage containers, and recipe books. The UK (Imperial) fluid ounce is slightly smaller at 28.4131 mL, used in British recipes and older Commonwealth standards. Confusingly, the terms are not interchangeable: a US fluid ounce and a UK fluid ounce differ by about 4%. Our converter makes both values visible simultaneously so you never mix them up. This converter is especially useful in the kitchen, where switching between metric and imperial recipes is common. We display a kitchen context label alongside your result — for example, telling you that 5 mL is approximately one teaspoon, 237 mL is roughly one cup, or 473 mL is close to one US pint. This makes it much easier to visualize quantities without needing to memorize conversion factors. Beyond fluid conversion, our tool also includes an ingredient-based weight conversion mode. Because different liquids and dry ingredients have different densities, a milliliter of honey weighs much more than a milliliter of flour. Select an ingredient — water, milk, flour, sugar, butter, honey, olive oil, and more — and the converter will calculate the equivalent weight in ounces alongside the volume result. This is invaluable when a recipe gives a volume measurement but your scale measures in weight ounces. Other features include quick preset buttons for common kitchen volumes (5 mL teaspoon, 15 mL tablespoon, 30 mL, 50 mL, 100 mL, 250 mL, 500 mL, 1000 mL), a bidirectional swap button to convert oz back to mL, adjustable decimal precision, a visual bar chart comparing your volume to common kitchen measures, copy-to-clipboard functionality, print-friendly output, and CSV export of the full reference table. The reference table at the bottom covers 14 common volumes from 1 mL to 1000 mL with their US and UK fluid ounce equivalents, along with practical context descriptions. This makes it easy to scan and find the conversion you need without typing anything at all. Why does 1 oz vary? Because the US and UK defined their fluid ounces independently. The US fluid ounce is derived from the wine gallon, while the UK Imperial fluid ounce is based on the Imperial gallon. Always check which standard a recipe uses — US recipes dominate online, while UK and Australian recipes often use metric grams rather than fluid ounces entirely.

Understanding mL to Fluid Ounce Conversion

What Is a Milliliter?

A milliliter (mL) is a metric unit of volume equal to one-thousandth of a liter (0.001 L). The milliliter is part of the International System of Units (SI) and is the standard measurement for small liquid volumes in science, medicine, and cooking worldwide. One milliliter is equivalent to one cubic centimeter (cc), a term still used in medical contexts. Common everyday references: 1 mL is about 20 drops of water, 5 mL is one teaspoon, 15 mL is one tablespoon, 30 mL is approximately one fluid ounce, and 237 mL is one US cup. Beverage cans (355 mL), water bottles (500 mL), and wine bottles (750 mL) are all labeled in milliliters in most countries.

How Is the Conversion Calculated?

The conversion between milliliters and fluid ounces uses fixed conversion factors defined by international standards. For US fluid ounces: 1 US fl oz = 29.5735296875 mL exactly, so to convert mL to US fl oz, multiply by 0.033814022558919 (or divide by 29.5735296875). For UK Imperial fluid ounces: 1 UK fl oz = 28.4130625 mL exactly, so multiply by 0.0351950652 to convert mL to UK fl oz. For ingredient weight conversion, the formula is: weight in ounces = (mL × density in g/mL) ÷ 28.3495, where 28.3495 grams per ounce is the avoirdupois weight ounce standard. These factors are exact and defined by international agreement, making the calculations perfectly reproducible.

Why Does It Matter?

Accurate mL to oz conversion matters in several practical situations. In cooking and baking, recipes from different countries use different measurement systems — a US recipe might call for 8 fl oz of broth while a metric recipe asks for 240 mL. Confusing US and UK fluid ounces (which differ by about 4%) can throw off delicate baking recipes. In medicine and healthcare, dosages are often prescribed in mL but administered using ounce-marked measuring cups, especially for children's medications. In nutrition, food labels in the US use fluid ounces while the rest of the world uses mL, making comparison difficult without conversion. For travelers, a wine glass listed as '250 mL' on a European menu is about 8.45 fl oz — helpful when comparing to familiar US pour sizes.

Limitations and Caveats

Several important caveats apply to mL-to-oz conversion. First, fluid ounces measure volume, not weight — mixing up volume ounces and weight ounces is a common mistake. One fluid ounce of water weighs approximately one ounce by mass (because water has a density near 1 g/mL), but one fluid ounce of honey weighs significantly more. The ingredient mode in this converter addresses this by applying density factors. Second, the US and UK fluid ounce are different units that are frequently confused. US recipes vastly outnumber UK recipes online, so assume US fl oz unless specified. Third, density values for ingredients like flour and sugar vary with how they are packed or sifted — the values used here are typical averages and may not exactly match a specific brand or preparation. Fourth, extreme temperatures affect liquid density, so precise laboratory conversions may differ slightly from room-temperature kitchen use.

mL to Fluid Ounce Conversion Formulas

mL to US fl oz

US fl oz = mL / 29.5735

Divide the volume in milliliters by 29.5735 to get the equivalent in US fluid ounces.

mL to UK fl oz

UK fl oz = mL / 28.4131

Divide the volume in milliliters by 28.4131 to get the equivalent in UK (Imperial) fluid ounces.

US fl oz to mL

mL = US fl oz × 29.5735

Multiply US fluid ounces by 29.5735 to convert back to milliliters.

Quick Estimate

1 oz ≈ 30 mL

A quick mental approximation accurate to within 1.5% for US fluid ounces. Useful for recipes and medication dosing.

Volume Conversion Reference Tables

Common Kitchen and Medical Volume Conversions

Everyday volume measurements with their mL and fluid ounce equivalents for cooking, baking, and medicine.

Measurement	mL	US fl oz	UK fl oz
1 teaspoon	4.93	0.167	0.174
1 tablespoon	14.79	0.5	0.52
1 shot (US)	44.36	1.5	1.56
¼ cup	59.15	2	2.08
½ cup	118.29	4	4.16
1 cup (US)	236.59	8	8.33
1 cup (metric)	250	8.45	8.80
12 oz can	354.88	12	12.49
1 pint (US)	473.18	16	16.65
Wine bottle	750	25.36	26.40
1 liter	1000	33.81	35.20

US vs UK Fluid Ounce Comparison

The US and UK fluid ounces differ by approximately 4%. This table highlights the practical difference.

Volume (mL)	US fl oz	UK fl oz	Difference
100	3.381	3.520	0.139 oz (4.1%)
250	8.454	8.799	0.345 oz (4.1%)
500	16.907	17.598	0.691 oz (4.1%)
750	25.361	26.397	1.036 oz (4.1%)
1000	33.814	35.195	1.381 oz (4.1%)

Worked Examples

Convert 250 mL to US fluid ounces

A European recipe calls for 250 mL of milk. You need the US fluid ounce equivalent for your measuring cup.

Use the formula: US fl oz = mL / 29.5735

Substitute: US fl oz = 250 / 29.5735

Calculate: US fl oz = 8.454

250 mL equals approximately 8.45 US fl oz — just slightly more than 1 US cup (8 fl oz). You can safely use 1 cup plus about 1 teaspoon.

Convert 8 oz to mL for a recipe

A US recipe calls for 8 fluid ounces of chicken broth. You want the mL equivalent for a metric measuring jug.

Use the formula: mL = US fl oz × 29.5735

Substitute: mL = 8 × 29.5735

Calculate: mL = 236.588

8 US fl oz equals approximately 236.6 mL — just under 250 mL (one metric cup). Most recipes will work fine if you round to 240 mL.

Convert 500 mL to UK fluid ounces

A UK recipe asks for a measurement in fluid ounces and you have a 500 mL bottle.

Use the UK formula: UK fl oz = mL / 28.4131

Substitute: UK fl oz = 500 / 28.4131

Calculate: UK fl oz = 17.598

500 mL equals approximately 17.6 UK fl oz — about 1 UK pint (20 fl oz) minus 2.4 fluid ounces.

How to Use This Converter

Choose Conversion Direction

Select mL → oz to convert milliliters to fluid ounces, or oz → mL to go the other way. Use the swap button (arrows icon) to flip the direction instantly and carry over the current result as the new input.

Select US or UK Fluid Ounce

Toggle between US fluid ounces (29.5735 mL each) and UK Imperial fluid ounces (28.4131 mL each). US is the default and most common for online recipes. If you are using a British cookbook or following UK measurements, switch to UK. Both values are shown simultaneously in the results panel.

Enter Your Volume (or Use a Preset)

Type any milliliter value into the input field — decimals are accepted. Or click one of the quick preset buttons below the field for common kitchen volumes: 5 mL (teaspoon), 15 mL (tablespoon), 30 mL, 50 mL, 100 mL, 250 mL, 500 mL, or 1000 mL (1 liter). Results update automatically as you type.

Optionally Select an Ingredient for Weight Ounces

If your recipe calls for a weight in ounces but you are measuring by volume, select the ingredient from the dropdown (water, flour, sugar, honey, etc.). The converter applies the ingredient's density to calculate the equivalent weight in ounces alongside the fluid ounce result. This is particularly useful for baking where precision matters.

Frequently Asked Questions

How many ounces is 100 mL?

100 mL equals 3.3814 US fluid ounces or 3.5195 UK fluid ounces. In kitchen terms, 100 mL is just under 7 tablespoons (6.76 tbsp) or a little less than ½ cup. It is a common measurement for small beverage servings, medication bottles, and mini liquor bottles. The exact factor is: 100 × 0.033814 = 3.3814 US fl oz. If you are reading a US nutrition label, the serving size would appear as '3.38 fl oz (100 mL).'

What is the difference between a US fluid ounce and a UK fluid ounce?

A US fluid ounce equals exactly 29.5735296875 mL, while a UK (Imperial) fluid ounce equals 28.4130625 mL — about 4% smaller. This means that a UK recipe calling for 8 fl oz actually uses less liquid than a US recipe calling for 8 fl oz (227 mL vs 237 mL). The difference arises because the US and UK defined their gallons differently: the US uses the old wine gallon while the UK uses the Imperial gallon. Always check which standard your recipe uses; most online recipes are American unless otherwise stated.

How many mL is 1 oz?

One US fluid ounce equals exactly 29.5735 mL. One UK (Imperial) fluid ounce equals 28.4131 mL. A quick mental approximation: 1 oz ≈ 30 mL (accurate to within 1.5% for US). This approximation is commonly used for cocktail recipes and medication dosing. For precision work — especially baking or pharmaceutical calculations — use the exact values. Note that a weight ounce (avoirdupois) is different from a fluid ounce and equals 28.3495 grams, not a fixed volume.

Why is 8 oz not exactly 237 mL?

8 US fluid ounces equals exactly 236.588 mL — very close to but not exactly 237 mL. The 237 mL figure you see on water bottles and measuring cups is a rounded approximation used for practical purposes. The exact calculation is 8 × 29.5735296875 = 236.5882375 mL. Similarly, a 'standard cup' in the US is defined as exactly 8 US fl oz = 236.588 mL, rounded to 237 mL for labeling. This tiny discrepancy (0.17%) is negligible for everyday cooking but can accumulate in large-batch industrial recipes.

How do I convert mL to oz for a recipe — flour or sugar?

Flour and sugar are dry ingredients measured by weight (grams or ounces), not by fluid ounces. However, US volume recipes sometimes call for cups of flour, which you can cross-reference: 1 cup of all-purpose flour ≈ 125 grams ≈ 4.4 weight oz, even though the volume is 236.6 mL. Use our ingredient mode: select 'All Purpose Flour' or 'Granulated Sugar,' enter the milliliter volume, and the converter calculates weight ounces using the ingredient's density. For flour, density ≈ 0.593 g/mL (unsifted); for granulated sugar, ≈ 0.845 g/mL.

How many mL is a standard fluid ounce shot, cup, pint, and quart?

Common US volume equivalents in mL: 1 shot (1.5 fl oz) = 44.36 mL; 1 cup (8 fl oz) = 236.59 mL; 1 pint (16 fl oz) = 473.18 mL; 1 quart (32 fl oz) = 946.35 mL; 1 gallon (128 fl oz) = 3,785.41 mL. For quick reference: a standard 12 fl oz soda can is 354.88 mL (labeled 355 mL); a standard wine bottle is 750 mL = 25.36 fl oz; a 2-liter soda bottle = 67.63 fl oz. These equivalents are all in US fluid ounces.