9x13 rect to 9 round Pan Converter

Convert cake recipe dimensions. Compare area, height, batter volumes, and calculate the exact recipe multiplier.

Baking Pan Size Calculator

Recipe Calls For

You Want to Use

Recipe Multiplier

0.54x

To use a 9 inch Round Cake Pan instead of a 9x13 inch Rectangular Pan, multiply all ingredients in the recipe by 0.54.

Smaller Pan AlertThe target pan is significantly smaller. We suggest halving the recipe (0.5x multiplier) or you will have leftover batter. Do not fill the pan more than 2/3 full to prevent overflowing.

Why Pan Area Matters

A 9-inch round cake pan has an area of 63.6 square inches, whereas a 9-inch square pan has an area of 81 square inches. That is a 27% difference in area, meaning recipes cannot be swapped 1:1 without adjusting ingredients or baking duration!