OZ to Quarts Converter

How to convert fluid ounces to quarts

1 fluid ounce = 0.03125 quarts. To convert fluid ounces to quarts, divide by 32 (or multiply by 0.03125). A US fluid ounce is 1/128 of a US gallon, exactly 29.5735295625 ml. A US liquid quart is a quarter of a gallon, about 946.4 ml.

Worked examples

• 16 fluid ounces = 0.5 qt (16 ÷ 32)
• 48 fluid ounces = 1.5 qt (48 ÷ 32)
• 128 fluid ounces = 4 qt (128 ÷ 32)

Where this conversion comes up

Fluid ounces are used for drink cans, baby bottles, cosmetics and US recipes; quarts for motor oil, milk, stock and slow-cooker sizes. A US quart is exactly 32 fluid ounces, so 48 oz is 1.5 quarts and 128 oz (a gallon) is 4 quarts. Motor oil, broth and ice cream often come in quarts.

Quick estimate

Divide by 32.

Common mistakes

• Multiplying instead of dividing. A quart is larger than a fluid ounce, so the number of quarts must come out smaller: 16 fluid ounces = 0.5 qt.
• Mixing fluid ounces with weight ounces. A fluid ounce is a volume (29.57 ml); an ounce on a kitchen scale is a weight (28.35 g). A cup of flour is 8 fl oz by volume but only about 4.25 oz by weight.
• Using the imperial (UK) unit. This page uses US measures. An imperial gallon is 4.546 L (20% more than a US gallon), an imperial pint 568 ml and an imperial fluid ounce 28.41 ml.
• Rounding too early. Keep the full factor until the last step; rounding 0.0313 to 0.031 first puts large values noticeably off.

Going the other way? Use the quarts to oz converter. Related volume converters: ml to oz, oz to ml, liters to gallons, gallons to liters, liters to quarts, quarts to liters.