Convert 8-inch Round to 9-inch Round Pan
Multiply all your ingredients by 1.27
Quick Example:
3 Essential Adjustments
Check 5 Minutes Early
Thinner batter = faster baking. If original says 30 min, check at 25.
Same Temperature
Keep your oven at the same temp. Only reduce if edges brown too fast.
Expect Flatter Cake
Less dome, more even top. This is normal and doesn't affect taste.
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Real Success Story
"I used this conversion for my grandmother's chocolate cake recipe. Multiplied everything by 1.27, set timer for 25 minutes instead of 30. Came out perfect - just slightly flatter but equally delicious!"- Sarah M., Home Baker
Common Questions
Why exactly 1.27?
Math breakdown: 9-inch pan area (π × 4.5²) = 63.6 sq in. 8-inch pan area (π × 4²) = 50.3 sq in. Ratio: 63.6 ÷ 50.3 = 1.27
What if my recipe has eggs?
For 1.27x: 2 eggs → 2 eggs (no change), 3 eggs → 4 eggs, 4 eggs → 5 eggs. When in doubt, round up for structure.
What about springform or deep pans?
This conversion assumes standard 2-inch deep pans. For deeper pans, you may need less time adjustment since the batter depth stays similar.
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