How Many Cups in a Quart?

Twelve cups is three cartons

Twelve cups of stock sounds like a job. It's three cartons. Soup recipes list liquid in cups and stores sell stock in quarts, so the habit worth having is converting before you shop: divide the cups by 4 and round up to whole cartons. Ten cups is 2½ quarts, so that's three cartons with 2 cups to spare. I'd buy the third carton before I'd stretch a soup with water, unless the stock you have tastes stronger than you want it.

Scaling for a crowd is the same sum with one more step. A recipe for four that uses 6 cups of stock, cooked for ten, is 2½ times the batch: 15 cups, or 3¾ quarts. That's four cartons with 1 cup left over, and 15 cups is the number to take to the pot question below, because soup is about to get bigger than the stock.

Halving a quart, and the lines around it

Half a quart is 2 cups, and that's also one pint. A quarter of a quart is a single cup, so a recipe built around 1 quart of stock divides cleanly by two and by four. The awkward halves come from the odd amounts: 1 quart plus ½ cup is 4½ cups, and half of that is 2¼ cups. That's still easy with a standard set, just less pleasant to work out with a spoon in your other hand. When a recipe mixes quarts and tablespoons on the same line, the one-page conversion tool will put them in a single unit first.

Halving the liquid is the simple part of a half batch. For everything else on the ingredient list, I'd hand the whole thing to the recipe scaler, because doing eleven lines of fractions in your head is how a half batch ends up with a full batch of salt. Salt is also the one line I wouldn't scale and forget. Add it in stages and taste, whichever direction you've scaled.

Will a double batch fit in the pot?

Scaling has a physical limit that no chart can fix. Those 15 cups of stock are 3¾ quarts, and say the vegetables and everything else add 2 quarts more. That's 5¾ quarts going into a 6-quart pot, a quarter-quart of headroom, or a single cup. Double a smaller soup with 3 quarts of liquid and you're at 6 quarts, which is 24 cups, before a single carrot joins it. If your pot is sold by its capacity in quarts, add up the liquid and the solids before you commit. Enter 24 cups above and the converter answers in quarts, which is the language the pot speaks.

When the total comes close to the rim, I'd split the batch between two pots. Stirring a brim-full pot is unpleasant, and a pot that can't be stirred is hard to season evenly. Two smaller pots mean more dishes, which I'll accept in exchange for not mopping the stovetop. For quantities past this point, see how many cups are in a gallon.

Is a quart container really 4 cups?

If it's stamped 32 oz or 1 qt, 4 cups is what it's built to hold, measured to wherever the maker measured. That's usually a detail worth checking once. Pour 4 measured cups of water into it and look at where the level lands, and the container becomes a measuring tool you can trust for every batch after that.

For storing stock, I'd stop filling a little below the top so you can carry the thing to the fridge without wearing some of it, and write the actual amount on the lid. "Quart-ish" is not much help when you're counting what you've got left for next month's soup.

The quart basket is a different quart

Stock and milk are liquid quarts. A quart basket of strawberries is a dry quart, 67.2 cubic inches or about 1.101 liters in NIST Handbook 44, which is about 4⅔ cups of space. The same split runs through the pint, so don't divide a fruit basket by 4 and expect the recipe to agree.