Ounces to Liters (fl oz to L)

How to convert ounces to liters

Multiply the fluid ounces by 0.0295735, or divide by 33.814:

liters = fluid ounces × 0.0295735295625

64 fl oz × 0.0295735 = 1.893 L. The factor is exact: NIST defines the U.S. fluid ounce as 29.5735295625 milliliters, and a liter is 1,000 milliliters. For a quick estimate, divide by 34 — the answer is about 0.5% low. To go the other way, multiply liters by 33.814, or type the liters into the second field.

Ounces to liters chart

Bottle sizes in ounces and liters

U.S. labels show both units, and the metric size is usually the real one: a “16.9 fl oz” bottle is a 500 mL bottle rounded to ounces.

To total a day of drinks, open Convert a list of values, paste each amount on its own line, and download the list; the column of liters adds up to the total. Three 16.9 oz bottles and a 20 oz bottle are 70.7 fl oz, or 2.09 liters.

U.S. and UK fluid ounces

A British fluid ounce is 28.41 mL, about 4% smaller than the U.S. fluid ounce of 29.57 mL. For a recipe from the UK or an older Australian or Canadian cookbook, choose UK fluid ounce in the switch above the converter: 20 UK fl oz (an imperial pint) is 0.568 L, while 20 U.S. fl oz is 0.591 L. The result shows the other ounce on its own line, so you can see the difference without switching.

A liter is not a quart

A liter and a U.S. quart are close but not equal: a quart is 32 fl oz (0.946 L), a liter is 33.8 fl oz. In a recipe the 6% difference rarely matters; for a container or a fuel can it adds up — four liters are 4.2 quarts. For other units, see ounces to milliliters, fluid ounces to gallons or liters to gallons.