Cake Pan Size Converter
Don't have the pan a recipe calls for? Pick what the recipe uses and what you have — we compare them by base area and tell you how to adjust the batter and bake time.
9×13 rectangle
117 in²
→
9" round
64 in²
Size
54%
9" round is smaller and may overflow. Use about 54% of the batter (×0.54) — bake the rest separately — and expect a slightly longer bake time.
How pan substitution works
Cakes bake evenly when the batter depth is similar, so the trick is to match the pan's base area, not its name. If the new pan is bigger, scale the recipe up so the layer isn't too thin; if it's smaller, use less batter so it doesn't overflow. Always re-check the bake time, since depth changes how fast the center sets.
Frequently asked questions
- Can I use a 9x13 pan instead of two 9-inch round pans?
- Yes — a 9×13 pan (117 in²) holds about the same as two 9-inch rounds (about 127 in² combined), so a two-layer cake recipe fits a 9×13 well. It will bake as a single thicker layer, so add a few minutes.
- How do I substitute a square pan for a round one?
- Match the area. A 9-inch round (about 64 in²) is very close to an 8×8 square (64 in²), so they swap directly. A 9×9 square (81 in²) holds more, like a 10-inch round.
- Do I need to change the bake time when I change pans?
- Usually yes. A larger pan spreads the batter thinner so it bakes faster; a smaller, deeper pan bakes slower. Start checking 5–10 minutes before the original time and use a toothpick.
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