US Cups to Milliliters Converter
Convert US cups to milliliters and back, instantly.
Translate US cup measurements precisely
US customary cups appear throughout American recipes, while milliliters provide a finer metric volume. Cookbook conventions sometimes round a cup to 240 milliliters, and metric cups use 250 milliliters, so this page identifies the US customary definition and avoids silently mixing those kitchen standards.
The default 2 US cups converts to 473.176 milliliters. In reverse, 500 milliliters converts to 2.11338 US cups. These are volume-to-volume results, so ingredient density does not enter the equation. A cup-to-gram conversion would require a separate ingredient-specific density.
Private recipe conversion on your device
Recipe quantities stay in your browser and are not stored or transmitted. The calculation uses a fixed unit definition and does not change for flour, water, or sugar when both sides are volume. Measuring-cup markings and recipe rounding can still introduce small practical differences.
Frequently Asked Questions
How many milliliters are in a US cup?
One US customary cup equals approximately 236.588 milliliters.
Why do some recipes call a cup 240 or 250 milliliters?
Recipes often round the US cup to 240 milliliters, while a metric cup is defined as 250 milliliters. This tool uses the US customary cup.
Does ingredient density matter for this conversion?
No for liquid volume to volume. Density matters only when converting a cup volume into grams or another mass unit.
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