One cup is equal to 236.6 milliliters (mL) in the United States customary system. However, if you are using the metric cup, which is used in Canada and other Commonwealth countries, one cup is equal to 250 mL. It is important to note that there are slight variations in the size of a cup depending on the country or region. For example, a UK cup is equal to 284 mL. Here is a conversion chart for common cup measurements to milliliters:

• 1/4 cup = 59 mL
• 1/3 cup = 79 mL
• 1/2 cup = 118 mL
• 2/3 cup = 158 mL
• 3/4 cup = 177 mL
• 1 cup = 236.6 mL
• 1 1/2 cups = 355 mL
• 2 cups = 473 mL

It is important to use the correct measurement that was used when the recipe was created to ensure the correct outcome.