1 cup (US customary) is equal to approximately 236.6 milliliters (mL).
This is the standard measure used in cooking and volume conversions in the United States. Some variations exist depending on the context (e.g., metric cup is often considered 250 mL, and for nutrition labeling in the US, a cup may be defined as 240 mL), but the commonly accepted value for 1 US cup is 236.6 mL.
