Cake pan size converter
Adjust a recipe to a differently sized baking pan.
Your inputs
Your results
Ready when you areYour results will appear here.
How it works
Compare round or rectangular pan geometry, including your intended batter depths, to estimate an ingredient multiplier for similar batter volume per area.
Read the source reference ↗A few things to know
Pan dimensions must use the same unit and internal measurements. Batter depth differs from pan capacity; allow rise headroom. Baking time, heat flow and recipe suitability require separate checks.
When to use this tool
Estimate a recipe multiplier from pan geometry. At equal batter depth, the ingredient factor is the ratio of base areas.
- Adapt a cake recipe.
- Compare pan areas.
- Estimate a batter multiplier.
How to use cake pan size converter
Prepare the inputs
Enter the quantities and units used by your source.
Choose the settings
Choose the assumptions and compare them with your actual situation.
Review and export
Review the result, then download the calculation report.
Try the supplied example
Inputs
from shape: Round; from width: 8; from length: 8; to shape: Rectangle; to width: 9; to length: 9; from depth: 2; to depth: 2
Result
An 8-inch round pan changed to a 9 × 9 pan at equal batter depth needs about 1.611444 times the batter.
What it means
Check recipe rise and pan headroom; do not scale baking time by this factor.
Common mistakes to avoid
Measure internal dimensions consistently
Measure internal dimensions consistently.
Leave rise headroom and check doneness
Leave rise headroom and check doneness.
Frequently asked questions
Definitions, edge cases, and practical next steps for this tool. Search all tool FAQs ↗
Which dimensions should I measure?
Internal base dimensions, in one consistent unit.
Is depth the pan height?
No. Enter intended batter depth, leaving room for rise.
Can I compare round and rectangular pans?
Yes. A round pan uses diameter; a rectangular pan uses width and length.
What if I change batter depth?
The multiplier includes the ratio of intended batter volumes.
Is cooking time scaled too?
No. Geometry alone does not predict doneness or heat transfer.
Are shaped or tapered pans supported?
No. The model uses simple cylinders and rectangular prisms.
Are my inputs uploaded or stored?
Processing happens locally in your browser. This tool does not upload inputs. Downloads stay on your device; sharing or opening them in another service is your choice.
What should I check before using the output?
Pan dimensions must use the same unit and internal measurements. Batter depth differs from pan capacity; allow rise headroom. Baking time, heat flow and recipe suitability require separate checks.
Explore the topic in the blog
Sources and method
Use the references below to check definitions and platform guidance. The model’s scope and limits are explained above. Read our editorial standards.