Ok, I loked at both charts:
http://www.earlenescakes.com/ckserchart.htm
http://www.wilton.com/cakes/making-cakes/baking-party-cake-2-inch-pans.cfm
and this:
http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1300478
but still didn't get the height of the cakes in those charts.
I have an order for 20 people and it has to be round.
How tall do I need the cake to be for an 8'' pan and how tall if I go with the 10'' pan?
Any advice would be highly appreciated!!!
Servings generally are arrived at by the footprint of the cake. The cake covers an eight inch circle whether it's 3 inches tall or 4 inches tall. It's the same footprint and the same number of servings can be cut. Of course the three inch tall cake is a bit smaller serving.
The wedding charts generally are for 4 inch tall cakes.
I use Wilton's wedding cake serving chart. (You have the party serving chart in the link)
If people cut servings bigger than that, they need to order more cake from me.
I have seen women cut sheet cakes so thin you can see the design on the plate through the cake. So I don't mess around with supplying family sized servings.
Cake cutting thoughts for you.
I used Earlene's chart to make a cake last weekend... Let me tell you, a 6" round cake is 8 REALLY FREAKIN' HUGE servings! I got 12 adequate servings out of that cake easily. Not sure how many I got from my 8" round since I only served a quarter of it...
Hubby was glad to have leftover cake to take to work Monday. 
Thank you, k8memphis and ThreeDGirlie. I just baked in a 10 pan. If its 4 tall, how many pieces do they get from it?
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