How many cake mixes for 16 square cake?

To make a 16-square cake, you'll typically need about 4 to 5 standard cake mixes, depending on the brand and the specific recipe instructions. Most cake mixes yield about 4 to 5 cups of batter, and a 16-inch square cake requires around 10 to 12 cups of batter. Always check the instructions on the cake mix box for the best results.