* 18.25 ounce boxes of cake mix have been replaced by 16.5 ounce and 15.25 ounce boxes. To compensate for the volume loss in a 16 ounce box, whisk 6 tablespoons all-purpose flour into the dry cake mix before proceeding with the recipe. To compensate for the volume loss in a 15.25 ounce box, add 1/2 cup + 3 tablespoons all-purpose flour and 1/4 teaspoon baking powder.
This cake may also be baked in the following paper-lined pans: two 9 x 5 x 3-inch loaf pans for 40 to 45 minutes; one 13 x 9 x 2-inch pan for 40 to 45 minutes; two 9-inch layer pans for 30 to 35 minutes; two 8-inch layer pans for 35 to 40 minutes; or one 9-inch tube pan for 60 to 65 minutes.
Source: Joys of Jell-O