* Ounces and Cups: There are two main types of ounces used for measuring liquids: fluid ounces (fl oz) and weight ounces (oz). We need to know which one you're referring to.

* Cups: There are different cup sizes depending on the context. For example, a US "cup" is 8 fluid ounces, while a metric cup is 250 milliliters.

Assuming you are asking about 12 fluid ounces (fl oz):

* 12 fl oz is equivalent to 1.5 US cups.

* To convert 12 fl oz to milliliters, we need to know the type of cup you're using.

Here's the conversion:

* If you're using a US cup: 12 fl oz = 1.5 cups = 355 ml

* If you're using a metric cup: 12 fl oz = 480 ml (approximately) = 1.92 metric cups

Let me know if you have a specific type of cup in mind, and I can give you a more precise answer.