Updated 19 July 2026 · Written by Daniel Wright
You can swap baking pans of similar area and adjust the bake time. Match the total surface area: an 8-inch square (64 square inches) is close to a 9-inch round (about 64), and a 9×13 (117) equals about two 8-inch squares or two 9-inch rounds. If the batter sits deeper, bake longer at a slightly lower temperature.
Substitute pans with a similar area. An 8×8 square swaps for a 9-inch round; a 9×13 equals two 8×8 or two 9-inch rounds. Deeper batter needs longer, slightly cooler baking; shallower needs less.
How to Substitute Pans
Match the area, not the shape
What matters is total surface area, which sets the batter depth. Pans with similar area hold the batter at a similar depth and bake alike.
Adjust for depth
If the substitute makes the batter deeper, lower the oven about 25 degrees and bake longer so the center cooks. Shallower batter bakes faster.
Watch doneness, not just time
Because depth changes, rely on a skewer test rather than the original time when you switch pan sizes.
Common Pan Size Equivalents
| Pan | Approx area | Substitute with |
|---|---|---|
| 8 x 8 inch square | 64 sq in | 9-inch round |
| 9 x 9 inch square | 81 sq in | Two 8-inch rounds |
| 9-inch round | 64 sq in | 8 x 8 inch square |
| 9 x 13 inch | 117 sq in | Two 8×8, or two 9-inch rounds |
| 10-inch round | 79 sq in | 9 x 9 inch square |
| 8 x 4 loaf | 32 sq in | Fill a 9×5 loaf less full |
Common Mistakes to Avoid
- Swapping pans of very different area without adjusting time.
- Overfilling a smaller pan, which overflows.
- Going by the original time instead of testing doneness.
Frequently Asked Questions
Can I use a 9×13 pan instead of two 8×8 pans?
Yes. A 9×13 has roughly the same area as two 8-inch squares, so a recipe for two 8×8 pans fits one 9×13. Adjust the bake time and test for doneness.
How do I substitute a round pan for a square one?
Match the area. An 8-inch square is close to a 9-inch round, and a 9-inch square is close to two 8-inch rounds. Deeper batter needs longer baking.
Do I change the temperature when I change pan size?
If the batter sits deeper, lower the oven about 25 degrees and bake longer so the center sets without burning the edges.
