Convert Volume from Fluid Ounces to Liters (fl-oz to l)

Fluid Ounce to Liter Conversion Formula

Whether you are following a recipe or comparing drink sizes, needing to measure liquids accurately is common.

In the United States, the fluid ounce is a standard unit of volume, while most of the world uses the metric system. If you need to convert ounces to liter values for school or travel, understanding the calculation is helpful for precise fluid ounce measuring.

To convert ounces to liters, you simply multiply the volume in fluid ounces by the conversion factor of approximately 0.0296.

• Liters (L) = Fluid Ounces (fl oz) × 0.0295735

Conversion Example

Let's say you have a large water bottle containing 32 fluid ounces. To find out how many liters that is, use the formula above:

32 fl oz × 0.0295735 = 0.946352 Liters

Therefore, 32 fluid ounces is equal to approximately 0.95 Liters.

How many fluid ounces are in one liter? One Liter (l) contains 33.8140226 Fluid Ounces (fl-oz) — the inverse of the factor above. Multiplying by 0.029573529651571238969 takes you from fluid ounces to liters; multiplying by 33.8140226 brings you back.

Put in words: one fluid ounce equals 0.029573529651571238969 liters, so the fluid ounce is the smaller unit of this pair. Converting between them never changes the amount of volume being measured — only the size of the unit you count it in.

What Is a Fluid Ounce (fl oz)?

A fluid ounce (fl oz) is a common unit used to measure volume in the imperial and US customary systems.

It tells you how much space a liquid takes up.

Is a US Fluid Ounce the Same as a UK Fluid Ounce?

This is a common point of confusion: no, they are not the same!

The US fluid ounce is slightly larger than the UK (Imperial) fluid ounce. This slight difference is crucial to remember for recipes and measurements, especially when converting between systems.

• 1 US fluid ounce (fl oz) is approximately 29.57 milliliters (ml).
• 1 UK (Imperial) fluid ounce (fl oz) is approximately 28.41 milliliters (ml).

Fluid Ounce (Volume) vs. Ounce (Weight): What's the Difference?

The word "ounce" can be tricky because it measures two different things:

A fluid ounce (fl oz) measures volume (how much space something occupies).

An ounce (oz) measures weight (how heavy something is).

Think of it like this: a fluid ounce tells you the size of a container, while a regular ounce tells you how heavy its contents are.

For example, one fluid ounce of honey is much heavier than one fluid ounce of cooking oil because honey has a higher density.

Where Did the Fluid Ounce Come From?

The idea of the fluid ounce has a practical history.

In the British Imperial system, it was initially defined as the volume taken up by one ounce of water at a specific temperature.

This simple link between weight and volume made it a convenient and intuitive unit for measuring everyday liquids like water, wine, and ale for centuries.

What is a Liter (l)?

A liter (l) is a fundamental unit used to measure volume in the metric system.

In simple terms, it measures the amount of space a substance occupies, like the amount of soda in a bottle. The plural form is liters.

Where Did the Liter Come From?

The liter was introduced in France in 1795 during the French Revolution.

It was created as part of a movement toward a more logical and universal system of measurement, which later evolved into the modern metric system.

Initially, the definition of a liter was based on the weight of one kilogram of pure water.

How Is a Liter Defined Today?

While the original definition was based on the mass of water, it was updated for greater precision and consistency.

Today, the official definition directly connects the liter to a unit of length, making it easier to understand.

So, how big is a liter?

A liter is officially defined as exactly one cubic decimeter (1 dm³).

This means a liter is the volume of a perfect cube with sides that are each 10 centimeters long (10 cm × 10 cm × 10 cm).

Liter vs. Litre: Which Spelling Is Correct?

The difference between "liter" and "litre" is simply a regional spelling choice—the volume they represent is precisely the same!

Both spellings are correct, and the one you use depends on where you are.

• Liter: This is the international standard spelling, used in the United Kingdom, Canada, Australia, and most other English-speaking countries.
• Liter: This is the preferred spelling in American English.

Fluid Ounce to Liter Conversion Table

Here are some quick reference conversions from Fluid Ounce (fl-oz) to Liter (l):

This conversion in other languages

Engineering datasheets across Europe write Fluid Ounce to Liter several different ways. The calculation is the same in every one of them.