Does anyone know how many a two layer 9 by 13 Wilton pan will feed? I have a cake on Saturday that needs to be for 35-40 people. I read that this would feed this amount but it looks awfully small. I am thinking about doing it all over again with the next size up. Any held would be appreciated.

I do 2-layer 9x13 cakes using the Wilton pans quite often, and they can easily serve 48. I approximate (go slightly more than) a 2 x 1 x 4 slice of cake, cutting the 13" dimension into six rows (just over 2" wide) and then cut each row into 8 slices (each just over 1" wide).

If you want to go a bit larger, and serve 2 x 1 1/2 x 4 pieces, you can still get six rows out of the 13" dimension and six slices in each row, for a total of 36 slides. Those are some pretty big pieces of cake, though!

Great thanks!!! That is what I made but it doesn't look like it would feed that many!!!