Free recipe tool
Baking pan converter
Compare interior footprints or known usable capacities to find an ingredient multiplier.
Method
Geometry or measured capacity
For the same batter depth, the scale factor is target interior area divided by original interior area. Round pans use π × (diameter / 2)². Rectangular pans use length × width. Capacity mode divides the target usable capacity by the original usable capacity.
Capacity and unit factors follow NIST SP 1020.
This multiplier compares footprint or usable capacity. It does not make pans equivalent or calculate bake time.
Worked example
A 20 cm square pan has a 400 cm² footprint. A 25 cm square pan has a 625 cm² footprint, so the ingredient multiplier is 1.5625.
Good to know
Pan conversion questions
What does same batter depth mean?
It assumes the batter depth stays the same while the interior footprint changes.
What should I enter for capacity?
Use a manufacturer-stated or visitor-measured usable capacity.
This multiplier compares footprint or usable capacity. It does not make pans equivalent or calculate bake time.
Keep the resized quantities together
Record your calculated ingredient amounts when you organize the recipe in a cookbook.