What size cake pan can you substitute for 3 round pans?

Here's why:

* Volume: Three round pans have significantly more volume than a single pan, even a very large one.

* Baking Time: A larger cake would take much longer to bake than three smaller cakes, likely leading to uneven cooking.

Instead of substituting:

* Consider using a larger rectangular pan: A 9x13 inch pan will hold approximately the same amount of batter as three 8-inch round pans, but it's not a perfect match. The cake will be thinner and will need a slightly adjusted baking time.

* Bake in two large pans: Two 9-inch round pans will also hold close to the same amount of batter as three 8-inch pans. You can use this option for cakes that require a thicker layer.

Remember:

* Adjust baking time based on the size of the pan.

* Always check for doneness with a toothpick or cake tester.

If you're unsure, consult your specific recipe for guidance.