Convert Cups (US) to Milliliters

How to convert cups to milliliters

One US customary cup holds 236.5882365 mL exactly — the cup is defined as 8 US fluid ounces, and that chain of definitions runs all the way back to the 231-cubic-inch US gallon. For kitchen work, multiply by the shortened factor 236.588.

1. Note how many cups the recipe wants.
2. Multiply by 236.588.
3. Round to whatever your jug or scale can display.

Worked example: 2 cups of milk comes to 473.1765 mL — one pour into a metric measuring jug instead of two trips with a cup. And for the rare reverse trip, 1 mL is a mere 0.004227 cup.

What is a cup (US)?

Unlike the liter, the cup was never a laboratory unit — it grew out of American kitchen practice and was later pinned down within the US customary system as 8 US fluid ounces, 236.5882365 mL exactly. American recipes measure nearly everything with it, dry ingredients and liquids alike, which is precisely what makes those recipes awkward for cooks everywhere else. You’ll usually meet it as a stack of nested metal or plastic measures rather than a graduated jug.

What is a milliliter?

The milliliter — a thousandth of a liter, per the SI prefixes in the BIPM’s brochure — is the unit metric kitchens run on. Measuring jugs, drink cartons, and recipe books across Europe, Asia, and most of the world express liquid volumes in mL, and because the liter is exactly one cubic decimeter, the milliliter ties cleanly into the rest of the metric system.

When you’ll need cups to mL

• Baking American recipes with a metric jug: when a US bread recipe asks for 3 cups of warm water, pour 709.7647 mL — your jug’s markings do the rest.
• Using a kitchen scale’s milliliter mode: many digital scales display mL for water-like liquids, so 0.5 cup becomes 118.2941 mL you can measure straight into the mixing bowl.
• Scaling for a crowd: tripling a sauce that starts at 2.5 cups lands you at 7.5 cups, which is 1774.4118 mL — far easier to handle as a single metric quantity than as stacked cup measures.
• Batch cooking and storage: an American soup recipe yielding 5 cups produces 1182.9412 mL, which tells you immediately which of your metric containers will actually hold it.
• Checking pot and slow-cooker capacity: a recipe that assumes a vessel holding 12 cups needs 2839.0588 mL of room — knowing that up front spares you a mid-recipe transfer between pans.