Here's how to calculate that:

* 1 US fluid ounce is equal to 29.5735 ml.

* Multiply 12 ounces by 29.5735 ml/ounce: 12 ounces * 29.5735 ml/ounce = 354.882 ml.

* Round to the nearest milliliter: 354.882 ml ≈ 355 ml.