Cake Mix Extender

Use this to upsize any older recipe that calls for an 18.25 ounce box cake mix.


  • 1 1/2 cups all-purpose flour
  • 1 cup granulated sugar
  • 2 teaspoons baking powder
  • 1/4 teaspoon baking soda

18.25 ounce boxes of cake mix have been replaced by 16 ounce boxes. To compensate for the volume loss, whisk 6 tablespoons all-purpose flour into the dry cake mix before proceeding with the recipe.


  1. Whisk all dry ingredients together and store in a clean glass jar.
  2. To increase a 15.25 ounce cake mix to 18.25 ounces, add 6 level tablespoons to a 15.25 ounce cake mix.