Round cake pan size converter
Enter the recipe tin diameter and your tin diameter to see how much to scale the ingredients.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter recipe tin diameter and your tin diameter.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Factor = (your diameter ÷ recipe diameter)², because area grows with the square of the diameter.
Example
Inputs: Recipe tin diameter = 8, Your tin diameter = 9. Result: Multiply the recipe by: 1.266; Change in area: 26.6%.
Limits and caveats
- It assumes both tins are filled to the same depth.
- Larger tins usually need longer and sometimes a slightly lower temperature so the middle cooks.
Questions about this tool
How much more for a 24 cm tin instead of 20 cm?
The factor is 1.44, so 44% more batter, even though the diameter grew only 20%.
A 9 inch tin instead of 8 inch?
Multiply by about 1.27; the area is about 27% bigger.
Do I shrink the recipe for a smaller tin?
Yes, the factor drops below 1: an 18 cm tin in place of 24 cm needs 0.56 of the recipe.