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About the baking pan converter
The recipe says a 9-inch round pan, but you only have a 9 × 13? The batter does not care about the shape — it cares about the area. A bigger pan needs more batter for the same thickness; a smaller one needs less.
Enter the recipe's pan and your pan — round, square or rectangular, in inches or centimetres, or pick a common size — and you get the number to multiply the recipe by. Press Scale my recipe by this to send it straight to the Recipe Scaler.
How to use it
- Choose the shape and size of the recipe's pan (or tap a common size)
- Do the same for your pan
- Read the number to multiply the recipe by
- Press Scale my recipe by this to resize the ingredients
Pan sizes and their area
| Pan | Area |
|---|---|
| 8-inch round | 50 sq in |
| 9-inch round | 64 sq in |
| 10-inch round | 79 sq in |
| 8 × 8 inch square | 64 sq in |
| 9 × 9 inch square | 81 sq in |
| 9 × 13 inch | 117 sq in |
| 10 × 15 inch (jelly roll) | 150 sq in |
| 9 × 5 inch loaf | 45 sq in |
| Round tin | Area |
|---|---|
| 18 cm | 254 cm² |
| 20 cm | 314 cm² |
| 22 cm | 380 cm² |
| 24 cm | 452 cm² |
| 26 cm | 531 cm² |
| 28 cm | 616 cm² |
Easy swaps
- 9-inch round ≈ 8 × 8 square — same area, no change needed.
- Two 9-inch rounds ≈ one 9 × 13 — use the recipe as it is.
- 9-inch round → 9 × 13: multiply by about 1.8.
- 8-inch round → 9-inch round: multiply by about 1¼.
- 20 cm → 26 cm round tin: multiply by about 1.7.
Baking time in a different pan
- Same depth, bigger pan: about the same time — check from the original time.
- Deeper batter (smaller pan, same recipe): lower the heat by 25 °F (15 °C) and bake longer.
- Thinner batter (bigger pan, same recipe): bake shorter — check 10 minutes early.
- Glass and dark pans bake faster than light metal ones.
Frequently asked questions
Can I use a 9 × 13 pan instead of two 9-inch rounds?
Yes. Two 9-inch rounds have about 127 sq in; a 9 × 13 has 117 sq in — close enough. Fill it, and check the time a little later, since the batter is a bit deeper.
How do I convert a round pan to a square pan?
Compare the areas: a round pan's area is 3.14 × the radius squared. A 9-inch round (64 sq in) matches an 8-inch square (64 sq in) almost exactly.
How much should I fill the pan?
About half to two-thirds full for cakes, so they have room to rise.
Does this work for loaf pans and sheet pans?
Yes — choose Rectangle and enter the inside width and length. For bundt and tube pans, compare the volume instead (fill with water and measure).
Should I measure the pan inside or outside?
Inside, across the top edge.
Good to know
- The converter compares areas, so it assumes the same depth of batter
- Your pans are saved in this browser
- Nothing you type is sent anywhere
Related tools
- Recipe Scaler — resize every ingredient
- Oven Temperature Converter — °F, °C, fan and gas mark
- Cups to Grams Converter — baking by weight
- Square Footage Calculator — area of any shape
- Cm to Inches — pan sizes in inches
