Pan Size Converter — Swap Cake Pans Without Guessing
Convert any cake pan size to another. Compare round, square, and rectangular pans by area and get the exact scaling factor for your recipe.
Switching cake pans does not have to be guesswork. Enter the original pan size and the pan you want to use, and this calculator shows you the area ratio and scale factor so you know whether to adjust your recipe.
Conversion Result
Original Area
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Target Area
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Scale Factor
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Common pan substitutions
- 8 inch round → 9 inch round: The 9 inch pan holds about 25% more. Use the same batter for a thinner cake.
- 9 inch round → 8 inch round: Reduce batter by about 20% to avoid overflow.
- 9×13 inch rectangular → two 9 inch rounds: Roughly equal total area, so the recipe splits evenly.
- 9 inch round → 8 inch square: Very close in area; usually a straight swap.
Baking equipment we trust
A good set of pans and a reliable scale make substitutions much easier. Browse baking pans on Amazon or OXO bakeware for durable options.