Fun tip I learned today.... pan sizes

How much does a 9x13-inch pan make?

• A 9x13-inch pan holds between 12 and 14 cups and has 117 square inches of surface area.
• Therefore, halving pretty much any recipe that goes into a 9x13-inch pan means that you need a pan that holds between 6 and 8 cups and has about 60 square inches of surface area.
• Fortunately, most of us have such a pan! An 8x8-inch pan holds 8 cups of volume, and has 64 square inches of surface area.

The 8x8-inch pan is just slightly bigger than a halved 9x13, so if halving a recipe you may want to reduce the baking time by about 5 minutes, and check on the casserole then. But ultimately, this has always worked well for me. When halving a basic 9x13 casserole, cut the recipe in half and bake it in an 8x8-inch pan.

http://www.thekitchn.com/thekitchn/tips-techniques/halving-casseroles-tips-for-reducing-the-size-of-a-recipe-137981