Cake Pan / Tin Size Converter
Use a different tin and scale your batter to fit perfectly.
- Original pan area
- 415 cm²
- New pan area
- 314 cm²
- Multiply every ingredient by
- 0.76×
- Keep batter depth similar — if the new pan is shallower, the cake bakes faster; if deeper, it bakes slower.
- Check for doneness 10–15 minutes earlier or later than the original recipe and use a skewer test.
- For very different sizes, adjust temperature by ±10 °C rather than only the time.
What is the Cake Pan Size Converter?
The cake pan converter compares the area of the tin a recipe calls for with the tin you actually have, then tells you how much to scale the batter. It handles round, square and rectangular pans and works in inches or centimetres. Use it whenever you want to swap a 9-inch round for an 8-inch square, make a bigger cake, or halve a recipe into a smaller tin — without ending up with overflowing or too-thin batter.
How to use the Cake Pan Size Converter
- 1 Pick the shape and size of the pan your recipe uses.
- 2 Pick the shape and size of the pan you want to use.
- 3 Read the factor and multiply every batter ingredient by it.
- 4 Adjust the baking time for the new cake depth.
Frequently asked questions
Can I use an 8-inch pan instead of a 9-inch? +
Yes, but an 8-inch round holds less, so use about 79% of the batter or expect a taller cake and a longer bake. The converter gives the exact factor for your two tins.
Does the baking time change with the pan? +
Usually. A deeper cake bakes longer and a shallower one faster — check 10–15 minutes earlier or later and use a skewer test.
How accurate are the results? +
The figures come from standard, tested references (USDA FoodData Central and King Arthur Baking) and are excellent starting points. Ovens, ingredients and equipment vary, so treat the numbers as a reliable guide and adjust to taste and doneness.
Is this calculator free, and does it send my data anywhere? +
Yes — it’s completely free and runs entirely in your browser. Nothing you type is uploaded or stored on a server; the maths happens on your device, even offline once the page has loaded.