How it works
Measure inside dimensions. The model assumes straight-sided pans with flat bases; tapered, shaped and tube pans are not represented. Same-depth mode preserves the original batter depth and checks whether it exceeds the new pan depth. Same-fill mode preserves the percentage of each pan occupied. The entered fill is an assumption, not a safe baking recommendation: allow recipe-appropriate headroom for expansion.
The formulaRound area = π × (diameter / 2)²
Rectangle area = length × width
Same-depth scale = new area / original area
Same-fill scale = new pan volume / original pan volume
Rectangle area = length × width
Same-depth scale = new area / original area
Same-fill scale = new pan volume / original pan volume