Might have just had an ahha moment....no laughing please. One the chart for how many cups needed for lets say a 16" sq pan it shows 15 1/2 cups of batter. Here is the part I think i just dinged on and need clarified.

This is for 2 cakes? As in a 2-layer cake?

I think it is for a 2-layer cake as a cake mix box fills 2 pans or 8" or 9 " and that is about 4 1/2 cups of batter depending on brand.

I have assumed (no don't say it) that it was for one pan.

Help

15.5 cups....one 16 square " pan

Then there wasn't an ahha moment, I will still end up with 31 cups for a 2 layer 16" cake.

Yep. The Wilton chart is how much batter you need per layer, not for both layers.

Even though the back of the cake mix box says it will fill 2 8in cakes, 2 9in cakes or a 13x9, it lies. That is fine for a family style cake. But if you are looking for nice pretty layers you need 3.5 cups of batter for a 8in pan. So you really need more than one cake mix to full fill two of them.