Fluid Ounces to Liters (fl oz to L) Converter

Fluid Ounces to Liters Formula

To convert fluid ounces to liters, multiply by 0.0295735.

Formula: L = fl oz × 0.0295735

For example, 32 fl oz × 0.0295735 = 0.946 L.

One US fluid ounce is defined as exactly 29.5735295625 milliliters, so multiplying by 0.0295735295625 gives an exact result. The commonly used factor 0.0295735 introduces a negligible rounding error — less than one part in a million for any practical kitchen, medical, or industrial measurement.

Common US Fluid Ounce Quantities in Liters

Converting familiar US fluid ounce benchmarks to liters reveals the underlying metric equivalents of everyday US products. A standard 8 fl oz cup = 0.237 L. A 16 fl oz pint = 0.473 L (just under 500 mL). A 32 fl oz quart = 0.946 L (just under 1 liter). A 64 fl oz half-gallon = 1.893 L (between a 1.5-liter and 2-liter bottle). A 128 fl oz gallon = 3.785 L. These benchmarks show why the liter became the practical global standard — metric containers (500 mL, 1 L, 1.5 L, 2 L) fall near but not exactly on US fluid ounce round numbers.

• 8 fl oz (1 cup) = 0.237 L
• 16 fl oz (1 pint) = 0.473 L
• 32 fl oz (1 quart) = 0.946 L
• 64 fl oz (half gallon) = 1.893 L
• 128 fl oz (1 gallon) = 3.785 L

Fluid Ounces to Liters Conversion Table

When to Convert Fluid Ounces to Liters

Cooking and following metric recipes: US measuring cups and liquid measures are calibrated in fluid ounces and cups. When a metric recipe calls for 0.5 liters of cream or 0.75 liters of broth, knowing the fl oz equivalent (16.91 fl oz and 25.36 fl oz respectively) allows measurement with standard US kitchen tools. Getting this conversion right is especially important in baking, where liquid ratios directly affect texture and rise — measuring 0.5 L as "about 2 cups" (16 fl oz = 0.473 L) would under-measure by 27 mL.

Hydration and health goals: The commonly cited recommendation to drink "8 glasses of water" typically means 8 fl oz per glass = 64 fl oz total = 1.893 liters. Many global health guidelines instead recommend 2 liters (67.63 fl oz) or 2.5 liters (84.54 fl oz) per day. Converting fl oz hydration targets to liters allows direct comparison with metric-based guidelines and helps people using liter-calibrated water bottles track intake against US fl oz recommendations.

International product comparison: US beverages, cleaning products, and personal care items list volumes in fluid ounces on their primary labels (as required by US law). Consumers comparing a 24 fl oz US product to a 700 mL (23.67 fl oz) international equivalent can only make an accurate comparison by converting both to the same unit. A 24 fl oz bottle holds 0.710 liters — about 10 mL more than the 700 mL international size, a negligible difference for most purposes.

Food service and commercial kitchens: Large-format US beverage containers — 32 fl oz (0.946 L), 64 fl oz (1.893 L), and 128 fl oz gallon (3.785 L) jugs — are purchased and portioned in fluid ounces but must be recorded in liters on European-format nutrition labels and import documentation. This conversion is routine for any US food business exporting or labeling products for international markets.

FAQ

How many liters is 32 fl oz?

32 fl oz ≈ 0.946 liters — just under a full liter. A 32 fl oz water bottle is about 54 mL short of 1 liter. To completely fill a 1-liter container, you need about 33.81 fl oz.

How many liters is 64 fl oz?

64 fl oz ≈ 1.893 liters. This is slightly less than two 1-liter bottles, or about 107 mL short of 2 liters. The US half-gallon (64 fl oz) is sold at a similar size to the 2-liter bottle but holds noticeably less.

How many liters is 128 fl oz?

128 fl oz (1 US gallon) ≈ 3.785 liters. This is the standard US gallon in metric terms — the definition used for converting between US and metric liquid volumes throughout the customary system.

How many liters is 8 fl oz?

8 fl oz (1 US cup) = 0.236588 liters (236.6 mL). This is the US customary cup — slightly less than the 240 mL "US legal cup" used on nutrition labels, and well under the 250 mL Australian metric cup.

What's the difference between US and UK fluid ounces?

US fl oz = 29.5735 mL. UK fl oz = 28.4131 mL. So 32 US fl oz = 0.946 L, while 32 UK fl oz = 0.909 L — a meaningful difference when comparing product sizes or recipe volumes from British sources. This converter uses US fluid ounces.