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| Pan | Area (sq in) |
|---|---|
| 8-in round | 50.3 |
| 9-in round | 63.6 |
| 8×8 square | 64 |
| 9×9 square | 81 |
| 9×13 rectangle | 117 |
Match the area, then the depth
Pans hold about the same batter when their areas match. A 9-inch round (63.6 sq in) is close to an 8×8 square (64 sq in). Two 9-inch rounds (127 sq in) are close to one 9×13 (117 sq in). If the new pan is deeper, lower the oven by about 25°F and bake longer; if shallower, check early.
Worked example
A recipe for an 8-inch round (50.3 sq in) moved to a 9-inch round (63.6 sq in) needs 63.6 ÷ 50.3 = 1.26 times the batter. Use the recipe scaler with that factor.
Frequently asked questions
Can I bake a 9-inch round recipe in an 8×8 pan?
Yes: the areas are nearly the same (63.6 vs 64 sq in).
Can I use a 9×13 instead of two 9-inch rounds?
Yes. The areas are close; bake a little longer and test with a skewer.
How do I measure a pan?
Measure across the top inside edge, not the outside or the base.