Baking Pan Size Converter

Often yes. An 8-inch square holds 64 square inches while a 9-inch round holds about 63.62, so the scale factor is 1.006 and the two are nearly interchangeable with no change to the recipe.

It divides the target pan area by the source pan area. A result between 0.95 and 1.05 is called nearly interchangeable, above 1.05 means the new pan is larger and needs more batter, and below 0.95 means it is smaller and would otherwise overflow.

A round pan is pi times the radius squared, where the radius is half the diameter. A square pan is the side length squared. A rectangle is length times width. Every area is in square inches, so use inches for the dimensions.

No. Pan area changes how much batter you need, not how hot the oven should be, so keep the temperature the recipe gives. Adjust the bake time instead and test the center with a skewer.

Aim for about two thirds full for cakes and quick breads so the batter has room to rise. If a scale factor above one would overfill your pan, bake in two pans or in batches rather than crowding it.

Yes. Set the How many count on either panel. Two 9-inch rounds, for example, total about 127.23 square inches, which the tool uses in place of a single pan when it works out the scale.

The tool compares surface area, which sets how thick the batter sits. Most everyday pans are a similar depth, so area is the main factor, but very shallow, very deep, dark or glass pans still need a closer eye on the bake time.

Those are not among the round, square and rectangle shapes here, and their sloped or hollow forms are measured by volume rather than flat area. For those, compare the cup capacity printed on the pan instead of using this area based estimate.

No. The comparison runs entirely in your browser, so the pan sizes you type stay on your device.