Pan Size Converter
Converting 9x13-inch pan to 9-inch round pan? Find out exactly how to scale your recipe and adjust bake time.
Units
Recipe scaling
scale ingredients down × 0.54
Area ratio: 63.62 / 117 sq in
If you scale the recipe
Keep the original temperature and bake time
Area scaling keeps the batter depth similar. Start checking doneness about 5 minutes early.
If you keep the full batch
Split across about 1.84 9-inch round pans
One target pan makes the full batch about 1.84× deeper. If using one pan, lower the oven by about 25°F (15°C) and allow extra center-bake time.
Popular conversions
9×13 pan to 9-inch round pan: practical conversion
The target has 0.54× the base area of the original. Scale the ingredients by that amount to keep batter depth close to the original; the deeper-batter comparison below applies only when you keep the full batch.
| Original recipe | Target-pan amount | Practical handling |
|---|---|---|
| 200 g flour | 109 g | Weighing keeps the scaled amount precise. |
| 3 large eggs | About 1.63 eggs | Beat the eggs, then weigh about 82 g of beaten egg. |
| 1 cup liquid or sugar | 0.54 cups (about 1/2 cups) | Use a measuring cup for liquids; weigh dry ingredients where possible. |
If you keep the full batch: deeper batter
With the same 4 cups of batter, the layer is about 0.49 in (1.25 cm) deep in the 9×13 pan, versus 0.91 in (2.31 cm) in the 9-inch round pan.
Bake-time starting point
For a scaled batch, keep the original temperature and time, then start checking about 5 minutes early. For a full batch in the target pan, plan on about 30–36 minutes for a brownie or snack cake that takes about 25–30 minutes in the original 9×13 pan. Pan material, recipe density, and the intended texture can shift the final time.
What Matters for This Conversion
- - Use about 0.54x ingredient multiplier.
- - A 0.54x scaled batch keeps roughly the original batter depth.
- - A full batch in one round is deeper; split it between two pans or lower heat and watch the center.
FAQ
What is the 9x13 to 9-inch round ratio?
Roughly 0.54x by area.
Can I split into two 9-inch rounds instead?
Yes. Two rounds often fit the full original batter better.
Will baking time increase?
Keep the original timing for a 0.54x scaled batch and start checking a few minutes early. A full batch in one round is deeper and takes longer in the center.
Do I need parchment?
For round cake release, parchment on the base is strongly recommended.