The amount of cake mix that will make two round cakes or one sheet cake will make approximately 24 cupcakes.
The amount of batter needed for a cake recipe varies depending on the size of the cake pan. A recipe that makes two 9-inch round cakes or one 9x13-inch sheet cake will make approximately 24 cupcakes.
When making cupcakes, fill each cupcake liner about 2/3 full with batter. This will allow room for the cupcakes to rise without overflowing.
Therefore, a recipe that makes two round cakes or one sheet cake will make approximately 24 cupcakes when each cupcake liner is filled about 2/3 full with batter.