how many ounces in one and one third cup
If its a liquid it's different because this is always taking up all the volume of a container. So 8oz is a cup (liquid) so 1/3 of the would be 2.6666666~ oz. That would depend on the density of what you are measuring. 1/3 cup of rocks would weigh (ounces) more than 1/3 cup of Styrofoam.