Formula
Round area = π × radius². Rectangular area = length × width. Multiplier = target area ÷ original area.
COOKING & BAKING
Pan Size Converter
Compare round or rectangular baking-pan areas.
CALCULATOR GUIDE
How to use the Pan Size Converter
Compare round, square and rectangular baking pans by surface area and calculate the recipe multiplier.
Worked example
A 9 in round pan has about 63.6 in² of area; an 8 in square pan has 64 in² and is nearly equivalent.
Assumptions and limits
This compares surface area. Different pan depth, material and batter depth can change baking time.
Frequently asked questions
Can I substitute an 8-inch square pan for a 9-inch round pan?
Their surface areas are nearly identical, though depth and material can still affect baking.
Does pan depth matter?
Yes. This tool compares surface area; confirm the target pan can safely hold the batter volume.
How this calculator works
Enter your known values and select Calculate result. Review units and inputs before relying on the planning estimate.
Actual quantities, prices and requirements can vary. Confirm critical work with a supplier or qualified professional.