Sources and method
The rule
For the batter to be as deep, the amount must follow the base area: π × (diameter ÷ 2)² for a round pan, side × side for a square, width × length for a rectangle. The factor is the area of your pan divided by the area of the recipe's pan.
Limits
Pans with sloped sides, tube pans and very deep pans hold a little more or less than their base suggests. Leavening does not always scale perfectly: for large changes, bake a test or keep the pan about two-thirds full.
Corrections
Found a mistake? Write to contact@niftyant.com.