Converting Milliliters and Liters to Cups

Which cup are you converting to?

A cup is not one fixed volume. The US customary cup is 236.5882365 mL, usually rounded to 236.6 mL or 237 mL. The metric cup used in recipes from several countries is a tidy 250 mL. US nutrition labeling defines a cup as 240 mL, which is a third figure you may meet on packaging. Older British recipes may also rely on the imperial pint of about 568 mL, which is larger than the US pint.

The differences are small, about 6% between the US and metric cups, but they are large enough to matter in baking. Before converting, decide which cup your recipe was written for. If the recipe uses milliliters throughout, the metric cup is the natural target; if it is an American recipe you are adapting, use the US cup.

From milliliters to cups

Divide the volume in milliliters by the size of the cup. For US cups divide by 236.588, and for metric cups divide by 250.

• 500 mL ÷ 236.588 = 2.11 US cups, or exactly 2 metric cups.
• 250 mL = 1.06 US cups, or exactly 1 metric cup.
• 750 mL = 3.17 US cups, or 3 metric cups.

Because a milliliter is the same as a cubic centimeter, these conversions depend only on volume and not on what is being measured. The type of ingredient only matters if you want a weight, which is a separate step.

From liters to cups

A liter is 1,000 mL, so one liter is 1,000 ÷ 236.588 = 4.227 US cups, or exactly 4 metric cups. For quick work, multiply liters by 4.23 for US cups and by 4 for metric cups. A 1.5 L bottle of stock or water is therefore about 6.34 US cups, and 2 L is about 8.45 US cups.

A useful sanity check is the US quart. It is 4 US cups, which equals 946 mL, a little under a liter. The gap is about 54 mL, or roughly 3½ tablespoons, so a liter is “4 cups plus a few tablespoons” in US terms.

As a worked example, a soup recipe from a metric cookbook calls for 1.2 L of stock. Multiplying by 4.227 gives 5.07 US cups, so five cups plus a splash. Dividing 1.2 L by 0.25 L gives 4.8 metric cups, which is why metric recipes usually round such amounts to the nearest convenient volume.

Common amounts at a glance

Metric recipes often use rounded milliliter figures that sit close to common US fractions of a cup. These approximations are accurate enough for soups, sauces and batters:

• 60 mL is about ¼ cup (59.1 mL exactly).
• 80 mL is about ⅓ cup (78.9 mL).
• 120 mL is about ½ cup (118.3 mL).
• 160 mL is about ⅔ cup (157.7 mL).
• 180 mL is about ¾ cup (177.4 mL).
• 240 mL is about 1 cup (236.6 mL).

For baking, where small differences in liquid can change a batter, convert with the exact factor rather than relying on the nearest fraction.

Turning decimals into measuring-cup amounts

A result such as 2.11 cups is correct but awkward to measure. Separate the whole cups from the remainder, then convert the remainder into tablespoons. One US tablespoon is about 14.79 mL and a cup holds 16 of them, so multiply the decimal part by 16.

Take 500 mL. That is 2 cups (473.2 mL) with 26.8 mL left over, or about 1.8 tablespoons. In kitchen terms, 500 mL is “2 cups and about 2 tablespoons”. For 250 mL, the amount above one US cup is 13.4 mL, a little less than one tablespoon. Where the measurement is not critical, a slightly heaped or scant spoon is perfectly fine.

From cups back to milliliters

Going the other direction, multiply cups by 236.588. One US cup is 237 mL, two cups are 473 mL, three cups are 710 mL and four cups are 946 mL. A half cup is 118 mL and a quarter cup is 59 mL. Rounding to the nearest whole milliliter is plenty for any recipe measured in a jug.

If a recipe asks for 1½ cups of milk and you have a jug marked only in milliliters, the answer is 1.5 × 236.588 = 354.9 mL, so 355 mL. Many jugs are also marked with cups, but those markings can use a different cup size from the one the recipe assumes, so a milliliter reading is the safer reference.

When you need grams instead

Milliliters convert to cups in the same way for every ingredient, but milliliters do not convert to grams in the same way. Water is close to 1 g per milliliter, while 250 mL of oil weighs about 230 g and 250 mL of honey weighs about 355 g. Typical charts differ by a few grams, so these are approximate figures.

A cooking converter such as this one has a volume tab for milliliters, liters, spoons, ounces, pints, quarts, gallons and both kinds of cup, and it shows the same amount in every unit at once. For weights, use its ingredient tab, which applies a typical density to the amount you enter.