Convert 9" Round to 9×13 Pan (×1.84 Layer to Sheet)
Multiply all your ingredients by 1.84
(Transform layer cake to sheet cake!)
Quick Example:
3 Key Adjustments for 9" Round to 9×13 Conversion
Similar Time
Use same time or add 2-5 min. Both have similar depth (~2 inches).
Same Temperature
Keep your oven at the same temp as the round pan recipe.
Watch Corners
Rectangle corners may brown faster. Check them at original time.
9" Round to 9×13 Recipe Calculator
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Why This Conversion is Popular
Converting from round layer cakes to 9×13 sheet cakes is perfect when you want casual, easy-to-serve portions instead of fancy layers. Great for potlucks, picnics, and family gatherings where you don't want to fuss with frosting layers.
- ✓ Easier serving: Cut into squares, no slicing required
- ✓ More portable: Sheet cakes travel better than layer cakes
- ✓ Less frosting: Just frost the top (or none at all!)
Common Questions About Round to Rectangle Conversion
Should I adjust the baking time?
Start with the same time as your 9-inch round recipe. Both pans have similar depths (about 2 inches), so baking time is comparable. Add 2-5 minutes if needed.
What about the shape change from round to rectangle?
The corners of the 9×13 pan may brown slightly faster. Check corners at the original baking time. If they're browning too quickly, tent with foil.
Can I just double my recipe?
Yes! 1.84× is very close to 2×. Doubling is easier math and you'll have slightly extra batter (great for cupcakes!). For precision, use 1.84×.
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