Craft Calculators

BakingNo. 503

Updated October 2026

Cake Pan Size Converter

Find how much to scale a recipe when you bake it in a different pan, round, square, rectangle or bundt, and get the ingredients multiplied for you.

Measure in

Measure pans across the top inside edge. For a bundt or odd shape, fill it with water to the brim and measure the water.

The recipe's pan
pans
in
in
in
Your pan
pans
in
in
in
Scale the recipe (optional)

Amounts at the start of each line are multiplied. Fractions such as 1 1/2 and ¾ work.

How to convert a recipe to a different pan size

Compare how much batter each pan holds. For pans of the same depth, that is the area of the base. Divide the area of your pan by the area of the recipe's pan and multiply every ingredient by the result. When the depths differ, or for bundt and tube pans, compare volumes instead.

Round pan area = 3.1416 × (diameter ÷ 2)² Square pan area = side × side Rectangle pan area = length × width Multiply recipe by = your pans' area ÷ recipe pans' area

Example. A layer cake baked in two 8 in rounds uses 2 × 50.3 = 100.5 sq in of pan. A 9 × 13 in pan is 117 sq in, so multiply the recipe by 117 ÷ 100.5 = 1.16, or bake it as written and expect a slightly thinner cake.

Cake pan sizes and how much they hold

Areas are exact. Volumes are for straight sides filled 2 in deep, so the real figure for a pan with sloped sides is a little less, but the ratio between two pans holds.

PanAreaVolume at 2 in deep
6 in round28.3 sq in3.9 cups
8 in round50.3 sq in7.0 cups
9 in round63.6 sq in8.8 cups
10 in round78.5 sq in10.9 cups
8 in square64 sq in8.9 cups
9 in square81 sq in11.2 cups
9 × 13 in117 sq in16.2 cups
10 × 15 in150 sq in20.8 cups
13 × 18 in half sheet234 sq in32.4 cups

An 8 in square and a 9 in round hold almost exactly the same, so recipes swap between them without changes. Two 9 in rounds hold about 9% more than a 9 × 13 in pan.

Baking time and temperature

  • Keep the temperature. Change the time, not the oven setting.
  • Deeper batter bakes longer. If the batter sits higher in the new pan, the middle needs more time. Shallow batter in a bigger pan bakes faster.
  • Start checking early. Test with a toothpick about two thirds of the way through the original time, then every few minutes.
  • Fill pans about half to two thirds full. Bake any extra batter as cupcakes.

Questions

How do I convert a recipe to a different pan size?

Work out the area of both pans, divide the area of your pan by the area of the recipe's pan and multiply every ingredient by the result. For pans of different depths, or bundt and tube pans, compare how much water each holds instead.

Can I bake a 9 × 13 recipe in two 9 inch round pans?

Yes. Two 9 in rounds are 127 sq in and a 9 × 13 in pan is 117 sq in, so the batter is about 8% thinner in the rounds. Bake at the same temperature and start checking a few minutes early.

Is an 8 inch square pan the same as a 9 inch round?

Almost exactly. An 8 in square is 64 sq in and a 9 in round is 63.6 sq in, so you can swap one for the other without changing the recipe or the baking time much.

How do I scale eggs when I multiply a recipe?

Round to the nearest whole egg for small changes. For an awkward amount such as 2 1/2 eggs, beat the eggs together and weigh or measure out the share you need. A large egg is about 50 g without the shell.

Do I change the baking temperature for a different pan?

No. Keep the temperature and change the time. Batter that sits deeper takes longer to bake through, and a thinner layer in a bigger pan bakes faster, so test with a toothpick early.

More calculators