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Converting fluid ounces to milliliters, the conversion factor below is needed:
one fluid ounce is equal to 29.5735 milliliters (rounded to four places).
Using a proportion of 1 fluid oz is to 29.5735 milliliters as x (what we are looking for in fluid ounces) is to 420 milliliters.
Complete the proportion, multiply 1 times 420 to get 420, then divide the 420 by 29.5735. Upon completing the math in this conversion, we get 14.2019 ounces.
So, our 420 ml is equal to 14.2019 ounces.
One thing to remember is that 16.9 ounces is 500 ml. Using this conversion factor, you can quickly estimate ounces to milliliters.