Cups to Quarts Converter

Convert cups to quarts — four cups to a quart, unless your cup is the 240 mL labelling cup, in which case four of them overshoot by 14 millilitres.

Conversion table

Cups	In Quarts
0.5	0.125 qt
1	0.25 qt
1.5	0.375 qt
2	0.5 qt
2.5	0.625 qt
3	0.75 qt
4	1 qt
5	1.25 qt
6	1.5 qt
7	1.75 qt
8	2 qt
9	2.25 qt
10	2.5 qt
12	3 qt
15	3.75 qt

📊 Cups in Quarts

2 cups½ quart
4 cups1 quart
6 cups1½ quarts
8 cups2 quarts
12 cups3 quarts
16 cups4 quarts = 1 gallon

Four Cups, Five Definitions

The US customary cup is 236.588 mL and is the one behind the 4-cups-per-quart rule. Four of them come to 946.35 mL, which is exactly one quart.
The US legal cup — the one on nutrition labels — is 240 mL. Four make 960 mL, 14 mL more than a quart. It is a rounding for labelling, not a kitchen measure.
The metric cup used in Australia, New Zealand and much of Canada is 250 mL. Four of those are 1 litre, which is 5.7% more than a quart.
A quart is always 4 of its own cups. What shifts is which cup the recipe assumes, and no recipe ever says.

Four Cups, One Quart

The US customary system stacks by twos above the cup: two cups make a pint, two pints make a quart, four quarts make a gallon. That puts four cups in a quart and sixteen in a gallon, and those two numbers cover almost every scaling problem a home cook meets. A stockpot listed as 6 quarts holds 24 cups; a recipe calling for 10 cups of stock needs 2½ quarts. Because the whole ladder is built on doubling, you can walk up and down it without arithmetic — halve to go down, double to go up — which is exactly why the system survived the metric century in American kitchens.

The Cup That Is Not 236.588 mL

In 1988 the FDA fixed a 'legal cup' of exactly 240 millilitres for nutrition labelling, because round numbers make serving sizes readable. That cup is 1.44% larger than the customary one. Four legal cups come to 960 mL against the 946.35 mL of a real quart — a difference of about half a fluid ounce. For a soup or a stew that is invisible. For a brine, a sugar syrup, a curing solution or a bread dough at a fixed hydration, it is a measurable shift in concentration, and it compounds every time you scale the batch. When a number comes off a nutrition panel rather than a recipe, it is the 240 mL cup, and it should be converted before it is trusted.

Five Cups in Circulation

US customary: 236.588 mL — half a US pint, the basis of the 4-cups-per-quart rule and of every American measuring set.
US legal: 240 mL — the FDA labelling cup. Appears on nutrition panels, never on a measuring cup.
Metric: 250 mL — Australia, New Zealand and most modern Canadian recipes. Four make exactly one litre.
Japanese: 200 mL — the gō-derived cup used in Japanese rice cookers and recipes. 18% smaller than the US cup.
British legacy: 284 mL — half an imperial pint, found in pre-1970s UK cookbooks. 20% larger than the US cup.
None of these is labelled on the recipe. Judge by origin: American sites mean 236.6, Australian ones mean 250, older British ones mean 284.

Scaling Pots and Batches

Pot sizes are in quarts, recipes are in cups. Multiply the pot size by 4 to know how many cups it takes: a 6-quart pot holds 24.
Never fill a stockpot past three quarters. A 6-quart pot is really 18 cups of working volume once it has to boil without spilling.
Freezing expands liquid by about 9%. Leave a cup of headroom per quart in any container going into the freezer.
Doubling a recipe past 8 cups usually means switching pots, not just doubling the numbers — evaporation rate changes with surface area.
For stock and brine, weigh instead of measuring by cup. A kitchen scale removes all five cup definitions at once.
A quart container from a takeaway is genuinely a quart: 4 cups, 32 fluid ounces. It is the most reliable free measure in an American kitchen.

Worked Examples

Including the one that matters

Ten cups of stock

4 cups = 1 quart
10 ÷ 4 = 2.5 quarts
Which is 80 fluid ounces, or 2.37 litres

10 cups = 2½ quarts

A brine measured with the labelling cup

4 customary cups = 4 × 236.588 = 946.35 mL = 1 quart
4 legal cups = 4 × 240 = 960 mL
960 − 946.35 = 13.65 mL more water, so the salt is 1.4% weaker

Same '1 quart', 1.4% off concentration

Frequently Asked Questions

How many cups are in a quart?

Four US customary cups. The ladder is 2 cups to a pint, 2 pints to a quart, so 4 cups to a quart and 16 cups to a gallon.

How many cups in 2 quarts?

Eight cups, which is also half a gallon, 4 pints or 64 fluid ounces. It is the volume of a standard half-gallon carton.

Is a cup always 240 mL?

No. 240 mL is the US legal cup, used on nutrition labels. The cup in measuring sets and recipes is the customary 236.588 mL. Australia and New Zealand use a 250 mL metric cup, and Japanese recipes use 200 mL.

Does the 240 mL cup change the answer?

By 1.44%. Four legal cups are 960 mL against 946.35 mL for a quart — about half a fluid ounce. Irrelevant in a soup, but it shifts concentration in a brine, a syrup or a dough measured by hydration.

How many cups in a gallon?

Sixteen. A gallon is 4 quarts and each quart is 4 cups. That also makes a gallon 8 pints or 128 fluid ounces.

How many quarts is 6 cups?

One and a half quarts, which is 3 pints or 48 fluid ounces. Six cups is the awkward size that no standard container matches, which is why recipes tend to round to 4 or 8.