How many cake mixes for a 12x12 square cake pan?

For a 12x12 square cake pan, you typically need about 2 standard cake mixes, depending on the recipe and the desired cake height. Each standard cake mix usually yields about 4-5 cups of batter, and a 12x12 pan requires approximately 8-10 cups of batter to fill it adequately. Always check the specific instructions on the cake mix box for the best results.