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The boxes I checked said one box would make a 13x9, so you will need about 1 1/2 boxes for a 12x18. Assuming the pan is deep enough you could use two boxes for a one layer 12x18 or you may want to make a two layer cake using 1 1/2 box per layer.

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12y ago
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11y ago

A 12x18x2 pan is a half sheet pan takes 14 cups of batter to make a one layer, 2" high cake. That should be about 3 boxes of box cakes. I recommend measuring out 14 cups of batter for the pan and baking any extra batter as cupcakes.

A tip: Bake the cake at 325 degrees F instead of 350 degrees F, so that the corners to not become overdone before the center of the cake is baked through.

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13y ago

You need 3 boxes of cake mix, Make sure you leave at least an inch from the top of the cake pan, so the cake has enough room to raise. Hope this helps!

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12y ago

One box. you just have to use a large bowl

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