Hi iwoolsey, That is a situation where I would make two full recipes, fill my 10 inch pans and use the left over batter for a 6 inch cake, or 8 inch depending on how much batter is left over.
I agree with Sandra... Here was my experience:
My cake conversion chart says to make 1-1/2 recipe for the 10" pan. I did it once & was quite short on the batter I needed to get a 2" layer. I needed to double the recipe, fill the pan(s) as needed. (Anything left over can be cupcakes or whatever you like.)
Hope this helps!
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