How to Convert a 9x13 Recipe for an 8x8 Pan

And vice versa.

breakfast potato casserole in teal dish
Pictured: Brunch Potato Casserole . Photo: Meredith Food Studios

We've all been there: Your recipe calls for a 9x13 pan but all you have is an 8x8 pan, or vice versa. Fortunately these two common baking dish sizes are really easy to go between. In fact, you likely won't even need to pull out a calculator.

Adjusting a Recipe for a Different Pan Size

one 8x8 casserole dish and one 13x9 casserole dish
Charles Worthington/Meredith

The area of a 9x13 pan is 117 square inches. The area of a 8x8 pan on the other hand, is 64 square inches, or close to half that of a 9x13 pan. This means you can scale a recipe down from a 9x13 pan to an 8x8 pan by simply halving the recipe. Conversely, to go from a 8x8 pan to a 9x13 pan, you double the recipe. And because there's not a major difference in the depth, there's no need to adjust the oven temperature or cooking time (although you never know when you'll need to add or subtract a few minutes depending on your oven, so do still consider any visual cues provided in the recipe to signify doneness, such as browning, cracking, etc.).

What If You Can't Halve the Ingredients?

Most ingredients are easy to halve. Take flour, for example: You can easily go from 1 cup to ½ cup or from 2 ½ cups to 1 ¼ and so on. However, there are other ingredients that are harder to halve, like a whole egg. Do you really need to halve those ingredients? It depends on what you're making.

For Casseroles

Fortunately, that extra tablespoon or so of liquid will make very little difference in the final result, so go ahead and use the whole egg.

For Baking

Eggs play an important role in adding moisture to, leavening, and binding the dough in baked goods. So if you're making a baking recipe like brownies or a sheet cake, you'll need to be a bit more precise about halving ingredients. The best way to do this is to weigh your ingredients using a digital food scale. A grade AA large egg weighs about 1.75 ounces without the shell. Here's how to halve an egg for baking:

  1. Start by cracking the egg into a bowl and beating with a fork or whisk until the yolk and the white are combined.
  2. Add an empty bowl to a food scale. Use the tare function to zero out the weight of the bowl.
  3. Add the egg to the empty bowl a little at a time until you reach about 0.875 ounces.

For even more pan shapes and sizes, check out our baking pan conversion chart.


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