Area scaling is only the first step
Pan depth, batter depth, oven temperature and doneness cues still matter. A wider pan can bake faster because batter is shallower, while a deeper pan can need more time. Use visual cues and internal temperature where appropriate.
Example
An 8 by 8 pan has 64 square units of area. A 9 by 13 pan has 117, so the scale factor is 117 / 64 = 1.83. An original 200 g ingredient would scale to about 366 g.
Common mistakes
Do not scale by pan length alone. A 9 by 13 pan is not just a little larger than an 8 by 8 pan; its area is much larger.
Limitations
Area scaling works best for similar pan depths and batter heights. Very deep cakes, cheesecakes, breads and delicate recipes may need recipe-specific testing.
Last reviewed: 2026-05-17