Question 1

How do I convert a recipe from a 9x13 pan to a 9x9 pan?

Accepted Answer

A 9x13 pan has 117 square inches of area, while a 9x9 has 81 square inches. To convert, divide 81 by 117 to get a scale factor of about 0.69, meaning you'd use roughly 70% of each ingredient. Our calculator does this math instantly for any pan combination.

Question 2

Can I use a round pan instead of a square pan?

Accepted Answer

Yes! You just need to match the volumes as closely as possible. An 8-inch round pan has about 50 square inches of area, similar to an 8x8 square pan (64 sq in) but slightly smaller. Use our calculator to find the exact scale factor for your specific swap.

Question 3

What happens if my new pan is bigger than the original?

Accepted Answer

If your new pan is bigger, your scale factor will be greater than 1, meaning you'll need MORE of each ingredient to fill it properly. For example, going from an 8x8 to a 9x13 gives a scale factor of about 1.83, so you'd need nearly double the recipe.

Question 4

Do I need to adjust the baking time when changing pan sizes?

Accepted Answer

Yes! A smaller, deeper pan generally needs more baking time, while a larger, shallower pan bakes faster. As a general rule, start checking for doneness about 10-15 minutes earlier or later depending on the size change. Always use a toothpick or thermometer to check.

Question 5

Does pan material affect baking time?

Accepted Answer

Absolutely. Dark metal pans absorb more heat and bake faster, glass pans heat more slowly but retain heat longer, and light aluminum pans give the most even bake. When switching pan materials, keep a close eye on your bake and adjust time accordingly.

Question 6

Is this baking pan converter free?

Accepted Answer

Yes! The Calculated Cook baking pan converter is completely free to use with no sign-up needed. Convert between any pan sizes instantly to get the perfect recipe every time.

Baking Pan Conversion Calculator

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