There are 5.41 ounces in 160 milliliters. Each ounce is equal to 29.57 milliliters, so 160 / 29.57 = 5.41. The easiest way to complete unit conversions is to use an online conversion calculator, which allows a user to input numbers and choose the units for conversion to receive an answer.
Though it appears to be metric, the milliliter is not a unit in the International Systems of Units. But because it is equivalent to a cubic centimeter, it is widely accepted. Ounces are a standard measurement for liquid and weight in the United States. When converting from ounces to milliliters, it is assumed that the substance is a liquid.