Baking Pan Size Converter

A cake pan size conversion chart 8 inch to 9 inch tool giving the exact batter multiplier. Use the free Baking Pan Size Converter below — enter your values and get instant results, right in your browser. Batter multiplier = area of your pan ÷ area of recipe pan. Areas: 8" round 324 cm², 9" round 410 cm², 10" round 507 cm², 8" square 413 cm², 9" square 523 cm², 9×13" 755 cm², 9×5" loaf 290 cm². Example: 9" round ÷ 8" round = 410.4 ÷ 324.3 = 1.265× batter.

How to use the Baking Pan Size Converter

Your recipe says 8-inch pan, you own a 9-inch — pour in the same batter and you get a thin, overbaked cake. This cake pan size conversion chart 8 inch to 9 inch tool compares pan areas so you know exactly how to scale the batter. Select your NEW pan as "From" and the RECIPE's pan as "To": the result is the multiplier for every ingredient. It covers round, square, rectangular, and loaf pans by their true baking area.

  1. In the From dropdown, select the pan you actually own (the NEW pan).
  2. In the To dropdown, select the pan size the recipe was written for.
  3. Read the result — it is your batter multiplier (e.g. 1.265 means 26.5% more batter).
  4. Multiply every ingredient by that number for the same cake depth.
  5. Adjust baking time: larger multipliers need 5–10 extra minutes; check with a skewer.

Formula

Batter multiplier = area of your pan ÷ area of recipe pan. Areas: 8" round 324 cm², 9" round 410 cm², 10" round 507 cm², 8" square 413 cm², 9" square 523 cm², 9×13" 755 cm², 9×5" loaf 290 cm². Example: 9" round ÷ 8" round = 410.4 ÷ 324.3 = 1.265× batter.

Worked example

Recipe for an 8-inch round, but you have a 9-inch round: select From = 9-inch round, To = 8-inch round → 1.265. Multiply everything: 200g flour becomes 253g, 3 eggs become 3.8 (use 4). Baking time rises ~5 minutes. For a 9×13" tray from an 8" round recipe: 754.8 ÷ 324.3 = 2.33× — basically double the recipe plus a third.

Frequently asked questions

Multiply all ingredients by 1.265 (the 9" pan is 26.5% larger in area). Bake 5–10 minutes longer and test with a skewer — the deeper batter needs more time.

Yes with scaling: an 8" square (413 cm²) is 27% larger than an 8" round (324 cm²), so multiply batter by 1.27. Corners also bake faster, so check doneness a few minutes early.

Yes — this converter assumes similar depth (~2 inches). If your pan is much deeper, keep the batter depth the same as the original (about half-full) rather than filling by multiplier alone, and extend baking time.

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