Cups to Milliliters

Converting Cups to Milliliters

To convert US cups to milliliters, multiply the number of cups by 236.588. This conversion is indispensable when adapting American recipes for metric kitchens. Since the US is one of the few countries still using cups as a primary cooking measurement, anyone outside the US (or using metric equipment) needs to make this calculation regularly.

One US cup equals exactly 236.588 mL, which is derived from the definition of a US gallon (3,785.411784 mL) divided by 16 cups per gallon. For quick mental math, rounding to 237 mL per cup gives you results accurate to within 0.2%.

Adapting American Recipes for Metric Kitchens

American recipes dominate the English-language internet, but most of the world measures liquids in milliliters and dry ingredients in grams. When you find an appealing recipe that calls for 2 cups of milk, you need to know that means 473 mL. Three cups of water is about 710 mL. A quarter cup of olive oil is 59 mL.

Many modern kitchen scales and measuring jugs include both mL and cup markings, which helps bridge the gap. However, if your measuring equipment is metric-only, having the cups-to-mL conversion memorized (or bookmarked) eliminates the need for dual-marked tools.

For dry ingredients, note that converting cups to milliliters gives you a volume measurement, but the ideal approach for dry ingredients in metric cooking is to convert to grams by weight. Flour, sugar, and cocoa powder have different densities, so a cup of flour and a cup of sugar weigh different amounts even though they occupy the same volume.

Common Cup Fractions in Milliliters

American recipes frequently use fractional cup measurements. Here are the most common ones converted to milliliters:

• 1/8 cup = 29.573 mL (about 2 tablespoons)
• 1/4 cup = 59.147 mL (about 4 tablespoons)
• 1/3 cup = 78.863 mL
• 1/2 cup = 118.294 mL
• 2/3 cup = 157.725 mL
• 3/4 cup = 177.441 mL
• 1 cup = 236.588 mL

Memorizing even a few of these values — especially 1/4 cup (59 mL), 1/2 cup (118 mL), and 1 cup (237 mL) — will make you much faster at converting recipes on the fly.

Measuring Cup Markings and Accuracy

US measuring cups typically show fluid ounce markings alongside cup fractions. A standard glass liquid measuring cup holds 2 cups (473 mL) or 4 cups (946 mL) and includes markings at every quarter cup. For metric users, some cups also show 50 mL or 100 mL increments on the opposite side.

The accuracy of measuring cups varies by quality. Professional-grade measuring cups are accurate to within 1-2%, while inexpensive plastic cups can be off by 5% or more. When precision matters — especially in baking — consider using a kitchen scale and measuring in milliliters or grams rather than relying on cup markings.

Why the US Still Uses Cups

The United States is one of only three countries (along with Myanmar and Liberia) that have not officially adopted the metric system. American cooking traditions, cookbooks, and kitchen equipment are deeply entrenched in the cups-and-ounces system. Despite periodic pushes toward metrication, cup measurements remain the standard in American home cooking.

Interestingly, the US scientific and medical communities do use metric measurements exclusively. So while a doctor prescribes medication in milliliters, a home cook measures chicken broth in cups — sometimes in the same household, on the same day. This dual system makes cups-to-mL conversion a practical daily skill for many Americans as well.