That depends on whether you mean UK or US fluid ounces. a uk fluid ounce is 28.4 ml a us fluid ounce is 29.6 ml So 30 ml is 1.06 fluid ounce UK, or 1.01 fluid ounce US.

50 milliliters is the equivalent of 1.69 fluid ounces. There are 29.573 milliliters in every U.S. fluid ounce and 28.413 milliliters in every UK fluid ounce.