Baking Pan Size Converter
Find how much to scale a recipe when you swap to a pan of a different size or shape.
How to use the Baking Pan Size Converter
- Choose the recipe pan shape.
- Enter the recipe pan diameter / side / length and pick its unit.
- Enter the recipe pan width and pick its unit.
- Enter the number of recipe pans.
- Choose the new pan shape.
- Enter the new pan diameter / side / length and pick its unit.
- Enter the new pan width and pick its unit.
- Enter the number of new pans.
- Press Calculate. The result updates automatically as you type, and you can switch the result unit at any time.
About the Baking Pan Size Converter
When a recipe calls for a pan you do not have, compare areas instead of guessing. Matching the surface area keeps the batter at the same depth, which keeps baking time and texture close to the original. If the new pan's area is larger, multiply the recipe up; if it is smaller, scale it down or fill the pan only one-half to two-thirds full and bake the extra as cupcakes.
Common equivalents: an 8 × 8 square (64 in²) is close to a 9-inch round (64 in²); a 9 × 13 (117 in²) is about two 8-inch squares; and a 10-inch round (79 in²) is about 1¼ times a 9-inch round. Glass and dark metal pans bake faster, so lower the oven by 25°F (about 15°C).
Formula
If the batter depth stays the same, the amount needed is proportional to the pan's area:
round area = π × (diameter ÷ 2)²
square area = side²
rectangle area = length × width
multiplier = new total area ÷ original total area
Two 9-inch rounds cover 2 × 63.6 = 127 in², and a 9 × 13 pan covers 117 in², so the multiplier is about 0.92.
Example calculation
Using the default values:
- Recipe pan shape = Round
- Recipe pan diameter / side / length = 9 in
- Number of recipe pans = 2
- New pan shape = Rectangular
- New pan diameter / side / length = 13 in
- New pan width = 9 in
- Number of new pans = 1
the calculator returns:
- Multiply ingredients by: 0.92 ×
- Recipe pan area (total): 127.2 in²
- New pan area (total): 117 in²
- Tip: The pans hold about the same amount, so use the recipe as written and adjust the time if the depth changes.
Frequently asked questions
Can I use a 9×13 pan instead of two 9-inch round pans?
Yes. The 9×13 has about 92% of the area of two 9-inch rounds, so the full recipe fits; the cake will be slightly thicker and may need a few extra minutes.
What size pan equals an 8-inch square?
A 9-inch round pan has nearly the same area (about 64 square inches).
Does pan depth matter?
Yes. This converter assumes the same batter depth. Deeper batter needs a lower temperature or longer baking time.
Last updated: · Category: Cooking calculators