Fluid ounces to liters (fl oz to l) converter

What is a fluid ounces to liters converter?

A fluid ounces to liters converter is an online tool that turns a volume expressed in fluid ounces into its equivalent in liters, and back again. It bridges two measurement systems: the customary system, where fluid ounces are common in the United States and the United Kingdom, and the metric system, where the liter is the standard unit of volume. The tool is handy whenever you deal with recipes, bottled drinks, lab solutions, or product labels that mix units from different countries.

US and UK fluid ounces

There are two fluid ounces in everyday use, and they are not the same size. The US fluid ounce is about 29.5735 milliliters, so 1 US fl oz equals roughly 0.0295735 liters. The UK (imperial) fluid ounce is slightly smaller, about 28.4131 milliliters, so 1 UK fl oz equals roughly 0.0284131 liters. Because the difference is small but real, always confirm which ounce a recipe or specification means before converting.

How does the converter work?

Enter a value on either side of the converter. Type a number of fluid ounces and the liter field updates instantly; type a number of liters and the fluid ounce field updates. You can also switch the unit on each side, choosing US or UK fluid ounces on the left and milliliters, liters, or centiliters on the right. The conversion runs both ways, so you never have to clear the form to reverse the direction.

Formula for conversion

To convert between fluid ounces and liters, multiply by the appropriate factor:

For US fluid ounces to liters: $\text{Liters} = \text{US fl oz} \times 0.0295735$

For liters to US fluid ounces: $\text{US fl oz} = \text{Liters} \times 33.814$

For UK fluid ounces to liters: $\text{Liters} = \text{UK fl oz} \times 0.0284131$

For liters to UK fluid ounces: $\text{UK fl oz} = \text{Liters} \times 35.1951$

Conversion table

The table below lists common fluid ounce amounts with their liter (l) equivalents for both the US and UK ounce:

Examples

Example 1: A single US fluid ounce

Convert 1 US fluid ounce to liters using the factor 0.0295735:

$1 \text{ fl oz} \times 0.0295735 = 0.0295735 \text{ liters}$

Example 2: A standard bottle of water

Many US water bottles hold 16 fluid ounces. To express that in liters, multiply by 0.0295735:

$16 \text{ fl oz} \times 0.0295735 = 0.473176 \text{ liters}$

Example 3: One liter back to fluid ounces

Convert 1 liter to US fluid ounces using the factor 33.814:

$1 \text{ L} \times 33.814 = 33.814 \text{ fl oz}$

Example 4: A two-liter bottle

A familiar 2-liter soda bottle converts to US fluid ounces as follows:

$2 \text{ L} \times 33.814 = 67.628 \text{ fl oz}$

Notes

• The US and UK fluid ounces differ, so pick the correct ounce type before converting.
• A US fluid ounce is about 29.5735 mL; a UK fluid ounce is about 28.4131 mL.
• The fluid ounce measures volume, not weight, so the same number of ounces can weigh different amounts depending on the liquid.
• Using one consistent unit throughout a project helps prevent rounding mistakes.

Frequently asked questions

How many liters are in 1 fluid ounce?

One US fluid ounce equals about 0.0295735 liters. One UK fluid ounce is slightly less, about 0.0284131 liters.

How many fluid ounces are in 1 liter?

One liter holds about 33.814 US fluid ounces, or about 35.1951 UK fluid ounces.

What is the difference between US and UK fluid ounces?

The US fluid ounce is about 29.5735 mL, while the UK (imperial) fluid ounce is about 28.4131 mL. The UK ounce is the smaller of the two by roughly 4 percent.

How do I convert 16 fluid ounces to liters?

Multiply 16 by 0.0295735 for US ounces, which gives about 0.473176 liters. If you only need milliliters instead, you can use our fluid ounce to milliliter converter.

Why might my conversion look off?

Check that you selected the right ounce type (US versus UK) and verify the value you entered. A small mismatch in the ounce definition will produce a noticeably different liter result for large amounts.

Is there an easy way to estimate the conversion?

For a quick mental estimate, remember that about 34 US fluid ounces make 1 liter, and that 1 US fluid ounce is roughly 0.03 liters.