I knew I had seen this somewhere!
http://www.earlenescakes.com/Fondantchart.html
http://www.thebakerskitchen.com/CAKE_SHOPPE/Fondant_Gumpaste_%20Accessories/Rolled_Fondant_Icing/Rolled_Fondant_Quantity_Chart/rolled_fondant_quantity_chart.htm
Looks like this is a little bit more comprehensive.
Here is the Wilton chart:
http://www.wilton.com/wedding/makecake/fondant/fondantamounts.cfm
I would take those lists with a grain of salt. Wilton says it takes 5lbs of fondant to cover a 14 inch cake. That's a lot of fondant. I don't know if I'm rolling mine thinner than you're supposed to, but it's not taking me that much. I think they may be trying to sell you more than you need. The cakes I made from their Having Fun with Fondant book had me color amounts for the different cakes. I tended to have quite a bit left over that went to waste.
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