It's important to note that this is an approximation, as there are actually two different types of ounces:

* Fluid ounces (fl oz): This is the most common type of ounce used for measuring liquids. There are approximately 29.5735 ml in 1 fluid ounce.

* Weight ounces (oz): This is a unit of weight, not volume.

So, when you say "ounces," you need to be specific about which type you mean. If you're referring to fluid ounces, then there are approximately 0.0338 fluid ounces in 1 ml.