How Many Ounces in a Quart? US, UK, Dry & Liquid Conversions

Anyone who’s ever followed a recipe only to end up with a soupy mess knows the pain of a measurement mix-up. The humble quart is a common culprit. A US liquid quart holds exactly 32 fluid ounces, but that number changes if you’re using a UK recipe or measuring dry ingredients. This guide breaks down the differences with conversion tables, system comparisons, and practical tips so you never guess again.

US liquid quart to fluid ounces: 32 fl oz · US dry quart to ounces (dry): 37.24 oz · UK imperial quart to fluid ounces: 40 fl oz · 8 oz cups per quart: 4 cups · Quarts in a gallon: 4 quarts · Pints per quart: 2 pints

The comparison table below shows the core differences across the three quart systems.

The implication: one measurement name can mean three very different volumes depending on context.

How many ounces are in a quart?

US liquid quart: 32 fluid ounces

• A US liquid quart equals exactly 32 US fluid ounces (UnitConverters.net (volume conversion tool)).
• It is one-fourth of a US gallon (UnitConverters.net).
• One US liquid quart is approximately 0.946353 liters (Britannica (measurement reference)).

US dry quart: 37.24 dry ounces

• The US dry quart is larger than the US liquid quart, used for dry goods like berries, grains, and produce (Britannica (measurement reference)).
• It equals 37.24 dry ounces or 1.101 liters (Britannica).

UK imperial quart: 40 fluid ounces

• The imperial quart holds 40 imperial fluid ounces (Open Textbook BC (culinary education resource)).
• It is based on the imperial gallon of 160 fluid ounces and equals approximately 1.136523 liters (Britannica).
• The British system uses one standard quart for both liquid and dry measure (Britannica).

Is 32 ounces the same as 1 quart?

US liquid quart: yes, 32 fl oz = 1 qt

• In the US customary system, 32 fluid ounces equal exactly 1 liquid quart (UnitConverters.net).

UK quart: no, 32 fl oz is less than 1 UK quart

• 32 imperial fluid ounces equal 0.8 imperial quarts (Open Textbook BC).
• Conversely, 1 imperial quart equals about 38.43 US fluid ounces (Wikipedia (general reference)).

What is the difference between a pint and a quart?

Pint vs quart: size relationship

• A quart is twice the size of a pint in both US and UK systems (Open Textbook BC).

US pint = 16 fl oz, US quart = 32 fl oz

• A US liquid pint is 16 fluid ounces; two pints make 32 fluid ounces, or one quart (Britannica).

UK pint = 20 fl oz, UK quart = 40 fl oz

• An imperial pint is 20 fluid ounces; two imperial pints make 40 fluid ounces, or one imperial quart (Open Textbook BC).

The pattern: switching between US and UK recipes means adjusting the pint-to-quart factor — the ratio is the same (2:1) but the base unit size differs.

What this means: a US cook doubling a UK recipe must account for the 20% larger imperial pint or risk a significant volume error.

Is there a difference between US and UK quarts?

US quart: 32 fl oz (0.946 liters)

• The US liquid quart is based on the US gallon of 128 fl oz (UnitConverters.net).

UK quart: 40 fl oz (1.136 liters)

• The UK imperial quart derives from the imperial gallon of 160 fl oz (Britannica).

Why the difference matters for recipes and science

• Using the wrong quart system can alter recipe proportions by 25% (Open Textbook BC).
• The UK may sell goods by the quart only if equivalent metric measure is also shown (Britannica).

How many 8 oz cups are in a quart?

4 cups of 8 oz each fill 1 US quart

• A US liquid quart contains exactly four 8-ounce cups (Open Textbook BC).

UK quart yields 5 cups of 8 oz each

• An imperial quart holds five 8-ounce cups, because 40 ÷ 8 = 5 (Open Textbook BC).

The pattern: In US kitchens, a quart equals 4 cups; in UK kitchens, it’s 5 cups. Always check the cup origin.

How many ounces are in a quart of water, oil, or milk?

Water: 32 oz per US liquid quart

• For liquids measured by volume, a US quart always equals 32 fluid ounces regardless of the substance (UnitConverters.net).

Oil: 32 oz per US liquid quart (volume)

• Volume remains 32 fl oz; weight differs because oil is less dense than water, but fluid ounces are volume, not weight (Britannica).

Milk: 32 oz per US liquid quart

• Same volume principle applies: a quart of milk fills 32 fluid ounces of space (Open Textbook BC).

The catch: Fluid ounces measure volume, not weight. A quart of water weighs about 2.09 lb, while a quart of oil weighs roughly 1.92 lb — but both are 32 fl oz.

How many ounces are in 2 quarts, 4 quarts, and a half gallon?

2 quarts = 64 fl oz

• 2 US liquid quarts equal 64 fluid ounces (UnitConverters.net).

4 quarts = 128 fl oz (1 gallon)

• 4 US quarts equal 128 fluid ounces, exactly one US gallon (Britannica).

Half gallon = 64 fl oz (2 quarts)

• A US half gallon equals 64 fluid ounces, or 2 quarts (UnitConverters.net).

How many 16 oz bottles make a quart?

Two 16 oz bottles equal 1 US quart

• 32 oz ÷ 16 oz per bottle = 2 bottles per quart (UnitConverters.net).

One 16 oz bottle equals half a quart

• A 16 oz bottle is 0.5 US quarts (Open Textbook BC).

Step-by-step: Convert quarts to ounces (US liquid)

1. Identify the quart system. If the recipe is from the US, assume liquid quart. If from the UK, use imperial quart. If dry goods like grains, use US dry quart.
2. Multiply the number of quarts by the correct factor:
   – US liquid quart: multiply by 32.
   – US dry quart: multiply by 37.24.
   – UK imperial quart: multiply by 40.
3. Write the result with the correct unit label (fl oz for liquid, oz by weight for dry).
4. Double-check by converting back: divide ounces by the factor to return to quarts.

Example: 2 US liquid quarts = 2 × 32 = 64 fl oz. 2 UK quarts = 2 × 40 = 80 fl oz.

Expert perspectives on quart measurement

The US liquid quart is defined as 57.75 cubic inches, exactly 32 fluid ounces.

— National Institute of Standards and Technology (NIST), as referenced in Britannica (measurement reference)

The imperial quart is one quarter of an imperial gallon, equal to 40 imperial fluid ounces. UK regulations require metric equivalents on packaged goods.

— UK National Measurement Office, as documented by Britannica (measurement policy)

The bottom line for every home cook and professional: always confirm the quart system before measuring. A 25% error can ruin a cake batter, a soup base, or a batch of ice cream.

Frequently asked questions

Related reading

• French Toast Casserole Recipe: How to Fix Common Mistakes — a recipe where quart conversions often trip up home cooks.
• Cookies and Cream Ice Cream: Origin, Recipe, Health — another kitchen guide that uses quart measurements.