Cups to Quarts Converter

How many cups are in a quart

A US liquid quart holds exactly 4 cups. That is the whole conversion, and it holds for water, milk, stock, oil and any other liquid a recipe measures by volume. Working the other way, one cup is one quarter of a quart, or 0.25 qt.

The same quart is also 2 pints, 32 fluid ounces, 946.35 milliliters and 57.75 cubic inches. Those numbers all describe one container, so a recipe that calls for a quart of stock can be filled with four level cups and nothing is lost.

The US quart is smaller than the imperial quart used in Britain before 1965 and smaller than the dry quart used for produce. A US liquid quart is 946.35 mL, an imperial quart is 1,136.52 mL and a US dry quart is 1,101.22 mL. If a recipe came from an old British cookbook, four cups will leave you about 190 mL short.

For everyday cooking the four cup rule is all you need. The rest of this page covers the cases where it breaks: dry ingredients, metric recipes and any recipe that lists weights instead of cups.

The conversion written out

Quarts equal cups divided by 4. Cups equal quarts times 4. If you want milliliters, multiply cups by 236.59, or multiply quarts by 946.35. The calculator above does all three at once and shows the amount in cups, quarts, fluid ounces and milliliters so you can check it against whatever measuring tool is in the drawer.

One caution about rounding: 4 cups is exact, but 236.59 mL per cup is rounded from 236.5882365. Four of those cups come to 946.35 mL, while a true quart is 946.352946 mL. The difference is 0.003 mL, which is far below anything a kitchen scale or measuring cup can resolve.

Halves and quarters are where people slip. Half a quart is 2 cups. A quarter of a quart is 1 cup. A third of a quart is 1.33 cups, which is 1 cup plus 5 tablespoons plus 1 teaspoon, and that is the amount that usually gets rounded to 1 1/3 cups in a recipe.

For amounts below a cup, stay in cups and tablespoons rather than dropping into decimals of a quart. A recipe that asks for 2 tablespoons of vinegar is asking for 0.125 cup, or 0.031 quart, and no measuring cup is marked that way.

Worked examples for common recipe amounts

Six cups of stock: 6 / 4 = 1.5 quarts. In metric that is 6 x 236.59 = 1,419.53 mL, and in fluid ounces it is 48.

Ten cups of brine: 10 / 4 = 2.5 quarts, which is 2,365.88 mL. A 3 quart pot will hold it with room to spare, a 2 quart pot will not.

Three cups of cream: 3 / 4 = 0.75 quart, or 709.76 mL. That is the amount in a small 24 fl oz carton plus a splash, which is why the carton sizes and the recipe amounts rarely line up.

Two quarts of water: 2 x 4 = 8 cups, or 1,892.71 mL. This is the direction people forget when a recipe is written in quarts and the only cup measure is a 1 cup scoop.

Half a cup of oil: 0.5 / 4 = 0.125 quart, or 118.29 mL. Small amounts like this are easier to read in tablespoons: 8 tablespoons make the same half cup.

Liquid and dry measuring cups are not the same tool

A liquid measuring cup is a pitcher with a spout and marks up the side. You set it on the counter, pour, and read the line at eye level. A dry measuring cup is a straight sided scoop that you fill and level with the back of a knife. Both hold the same volume when used correctly, but they are built for different jobs, and swapping them is where a lot of quiet errors come from.

For liquids, the pitcher wins because you can see the meniscus, the slight curve at the surface, and read the bottom of the curve. For flour and sugar, the scoop wins because you can level the top, which is the only way to get a repeatable cup. Fill a liquid cup with flour and you cannot level it, so the amount varies by 10% or more from scoop to scoop.

The bigger trap is the word quart on a produce label. A dry quart is a unit of volume for berries and grain, and it is 1,101.22 mL, about 16% larger than the liquid quart. A recipe that calls for a quart of strawberries means a dry quart if it came from a farm stand, and four cups of sliced berries will be short of that.

The 0.65 cup gap between a liquid quart and a dry quart is the reason a quart of blueberries looks like more than four cups. It is more, by volume, even though the berries settle.

Cups to quarts at a glance

The table covers the amounts that show up in recipes, from a quarter cup to a gallon. Fluid ounces are included because US measuring cups are usually marked in both cups and ounces, and milliliters because most of the world writes recipes that way.

Sixteen cups is a gallon, which is the next unit up and the one most stock pots are sold by. A 12 quart pot holds 48 cups, and that is the number to check before doubling a soup recipe for a crowd.

Why weight is not a substitute for volume

A cup is a volume. A gram is a weight. The two only line up when you know what the ingredient is, because a cup of flour and a cup of sugar do not weigh the same. This is the single most common conversion mistake in an American kitchen, and it is why a recipe that lists 2 cups of flour can be off by 30% depending on who scooped it.

All purpose flour scooped straight from the bag weighs about 140 g per cup, and the same cup spooned and leveled weighs about 120 g. Sugar is denser at about 200 g per cup. Water is 236 g per cup because a milliliter of water weighs a gram. Butter is 227 g per cup, which is exactly two sticks.

So a quart of flour weighs about 480 g and a quart of sugar about 800 g. If a European recipe gives you 500 g of flour, the answer is 4.17 cups, not 4 cups, and the difference is enough to change the texture of a cake. Use the volume converter for liquids and a kitchen scale for dry ingredients when the recipe gives weights.

Scaling a recipe up and down

Doubling is the easy case: double the cups and double the quarts, and the ratio stays at four. A recipe that uses 3 cups of milk becomes 6 cups, or 1.5 quarts, and that fits a 2 quart pitcher with space for the rest of the ingredients.

Halving is where the fractions bite. Half of 1.5 quarts is 0.75 quart, or 3 cups. Half of 0.75 cup is 6 tablespoons, because 0.75 x 16 = 12 tablespoons and half of that is 6. Working in tablespoons for anything under a quarter cup keeps the arithmetic in whole numbers.

For a big batch, convert to quarts once and stay there. A soup for 20 people at 1.5 cups per serving needs 30 cups, which is 7.5 quarts, and that is a 8 quart pot filled close to the rim. Buying a 10 quart pot gives the headroom that stops a boil over.

One more scaling note: seasonings, salt and leavening do not scale linearly. Doubling a brine is fine, doubling the baking powder in a cake is not, and the quart math will not warn you about that.

Metric recipes, labels and the 240 mL cup

Most of the world writes recipes in milliliters, and a metric cup is not always 236.59 mL. The US legal cup used on nutrition labels is 240 mL. The metric cup used in Australia, Canada and New Zealand is 250 mL. A Japanese cup is 200 mL. If a recipe says 1 cup and came from one of those countries, four of those cups is between 800 mL and 1,000 mL, not 946 mL.

The NIST Metric Kitchen equivalency table lists 950 mL as 32 fluid ounces, 1 quart and 4 cups, which is the rounded figure to use when a recipe is written in round metric numbers. The underlying definition of the US gallon, and therefore the quart, comes from the SI definitions maintained by BIPM and the US customary tables in NIST Handbook 44.

When you convert a metric recipe to cups, round to the nearest quarter cup for liquids and to the nearest tablespoon for anything small. A 300 mL carton of cream is 1.27 cups, and 1 1/4 cups is the practical measure. The 0.02 cup you leave behind is 5 mL, less than a teaspoon.

Volumes here are US customary. Cup and quart sizes differ in other countries, and dry quart labels on produce are a different unit again, so check the source of a recipe before you scale it.