small=16
medium=24
large=32
small=16
medium=24
large=32
These no longer apply. McDonalds have shrunk the cup sizes. The large is now 28 ounces.
MarsFire2001-Actually, as of 6/30/2011, according to http://nutrition.mcdonalds.com/nutritionexchange/nutritionfacts.pdf, the large is indeed 32 oz.
cheapie - I can verify that the sizes at the top of this post are correct as of January 19th, 2013, but the large is currently being switched to 30 oz. (Source: I work there)
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