Just wanted to try a cake extender recipe.
I need enough batter for a 14" , a 10" and a 6", round, marble cakes to stack for a wedding cake.
How much do I need to plan for? Which recipe does it make a strong cake?
Thanks!

http://www.wilton.com/cakes/making-cakes/baking-wedding-cake-2-inch-pans.cfm

This website tells you how much batter you need per pan.

You will need 2 cups for each 6in round, 6 cups batter for each 10in round, and 10 cups for each 14 in round.

Which extender recipe are you using? Is it one using a single cake mix or the one that uses two cake mixes? What brand cake mixes are you using?

If you are using the single cake mix recipe I'd say it would make about 5-7 cups of batter, depending on which brand of mix and what flavors.

I'd say you needed to make about 6 recipes (using one cake mix).