WhiskMath

Cake Pan Size Converter

Swap any baking pan with confidence — see the fill ratio and how to adjust the bake time when you change pan size.

Fill ratio
71%
10 of 14 cups capacity
Swap type
Smaller
extra batter
  • Your pan is smaller — you will have excess batter, so do not overfill it.
  • The batter sits deeper, so add a few minutes — start checking around 29% past the original time only if needed.
  • Fill only about two-thirds full and bake any extra batter as cupcakes or a small dish.
  • A deeper layer bakes slower in the center — tent with foil if the top browns too fast.
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How to use this calculator

  1. Pick the recipe's pan

    Choose the pan size your recipe was written for from the list.

  2. Pick the pan you have

    Choose the pan you actually want to bake in.

  3. Read the fill ratio

    The calculator compares the two pans' batter capacities and shows what percentage of your pan the recipe will fill.

  4. Adjust the bake time

    Follow the guidance to fill the pan correctly and shorten or lengthen the bake time based on how the batter depth changes.

Recommended gear

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Escali Primo Digital Kitchen Scale

Weighing batter into each pan is the surest way to split a recipe evenly between different-sized pans.

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Silpat Premium Non-Stick Baking Mat

A reusable non-stick mat makes it easy to bake leftover batter as cookies when you size down.

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Common baking pan capacities

PanApprox. capacity
9×13 rectangular14 cups
10-inch tube pan16 cups
10-inch Bundt12 cups
10-inch springform12 cups
10-inch round11 cups
9-inch springform10 cups
9×9 square10 cups
8×8 square8 cups
9-inch round8 cups
9×5 loaf8 cups
8-inch round6 cups
8×4 loaf6 cups
12-cup muffin tin4.5 cups

Capacities are approximate batter volumes; pans within ~10% of each other usually swap directly.

Tips & best practices

  • Compare pans by capacity, not by width — a square pan always holds more than a round pan of the same measurement.
  • Fill any pan no more than two-thirds full so the batter has room to rise without overflowing.
  • When you move to a larger pan, the thinner layer bakes faster — start checking well before the original time.
  • When you move to a smaller pan, bake the extra batter as cupcakes rather than overfilling.
  • Tent a deep layer with foil if the top browns before the center is done.
  • Dark metal pans bake faster than light ones — drop the oven 25°F or pull the bake early if edges set too soon.

Frequently asked questions

How do I know if I can substitute one cake pan for another?
Compare the pans by their batter capacity in cups. If two pans hold within about 10 percent of each other, you can usually swap them directly. Larger differences change the batter depth and the bake time.
What size pan is equivalent to a 9x13?
A 9x13 rectangular pan holds about 14 cups of batter. Two 9-inch round pans (8 cups each) or two 8-inch square pans together hold a similar amount, which is why many 9x13 recipes can be split into layers.
Can I use a 9-inch pan instead of an 8-inch pan?
Yes, but the batter will spread thinner in the larger 9-inch pan, so it will bake faster. Reduce the bake time and start checking for doneness several minutes early.
What happens if my pan is too small for the recipe?
The batter sits deeper and can overflow or bake unevenly, with set edges and an underdone center. Fill the pan no more than two-thirds full and bake any extra batter separately as cupcakes or a small dish.
Do I need to change the oven temperature when I change pans?
Usually the temperature stays the same, but if a thin layer in a larger pan is browning before the center sets, lowering the oven by 25°F helps. A deep layer in a small pan can be tented with foil if the top darkens too fast.
How full should I fill a cake pan?
Fill cake pans about halfway to two-thirds full to leave room for the batter to rise. Overfilling is the most common cause of overflow and a sunken middle.
Does pan material affect the conversion?
The capacity conversion is about volume, so it holds regardless of material. That said, dark metal pans bake faster and glass holds heat longer, so check doneness early with dark pans and watch the edges with glass.
How do round and square pans compare?
A square pan holds more than a round pan of the same width because the corners add volume — an 8-inch square holds about 8 cups while an 8-inch round holds about 6. Always compare by listed capacity, not by width.

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Sources: King Arthur Baking pan volume reference; Joy of Baking bakeware capacity chart.

Results are estimates for informational use. For food safety, always confirm meat doneness with a thermometer against current USDA guidance. WhiskMath does not provide medical or dietary advice.