Red wine glasses have gotten larger over the years to allow room to swirl the wine. This helps let the wine "breathe" and releases some of the tannins in the wine. There are different wine glasses for the various types of red wines. Sizes typically range from 14 ounces to 35 ounces.
White wines do not need to be swirled so the glasses are much smaller....typically only 5 to 14 ounces.
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For calorie counting, most counters will give a fluid ounce description for the quantity. The average glass size in terms of the container has fluctuated over the years. In the 1960's the average glass size was four ounces. However, the average size of the 2000 glass is right ounces or more, more than doubling the serving size of 40 years ago.
Part of the problem with the glass sizing is that one assumes that "average size" is what the calorie counter says it is. Frequently the serving size is vastly different than the published serving size. Check the calorie counter serving size, then calculate the difference between the published size and the container you have. The results can be eye opening!