Thanks for the link Evil. I guess my frustration was at what "1 large" really amounted to. According to your calorie counter, (as well as the one I use) they say 1 large is 180 grams. I picked out the 2
smallest they had at the store, (most were WAY larger). I brought them home and weighed them on my super duper digital scale I got for Christmas, (a high end very accurate scale). The "smaller" sweet potato weighed 506 grams. Almost 3 times what the calorie counter says is a Large.

following me here? I guess my point is, one large is very deceiving! A large one at the store weighed upward to 30oz which would be almost 800 grams which would be well over 700 calories.
A large (180 grams) of sweet potato is about the size of a baseball....which I was really hoping for the size of a softball...or better yet a football...lol