Cake Pan Size Converter
Convert Pan Size
Calculate recipe adjustments when changing pan sizes
Formula
Scale Factor = New Pan Area / Original Pan Area. Round area = π x (diameter/2)². Square area = side². Multiply all ingredient quantities by the scale factor. Adjust bake time +/- 5-10 minutes based on batter thickness.
Frequently Asked Questions
Can I substitute a round pan for a square pan?
Yes. A round pan has about 78.5% of the area of a square pan of the same size. So an 8-inch round pan has an area of about 50 sq in, while an 8-inch square pan has 64 sq in. Adjust your recipe by the ratio of the areas.
How do I adjust baking time for different pan sizes?
When using a larger pan, the batter will be thinner and may bake faster (reduce time by 5-10 minutes). When using a smaller pan, the batter will be thicker and take longer (add 5-10 minutes). Always check for doneness with a toothpick.
What size pan should I use for a 9x13 recipe?
A 9x13 rectangle has an area of 117 sq in. Two 9-inch round pans (127 sq in total) or two 8-inch square pans (128 sq in total) are close substitutes. You can split the batter between two pans for a layer cake.
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