An 8-inch round cake pan holds about 6 cups of batter when it is 2 inches deep, and a 13 x 9 x 2-inch rectangular pan holds about 14 cups. So a 9×13 pan is a little more than twice the size of one 8-inch round, and the conversion is mostly about batter depth.
If your recipe is written for one 8-inch round and you want to bake it in a 9×13, this page shows how much to scale, what happens if you do not, and how to adjust the bake.
8-Inch Round vs 9×13: The Numbers
| Pan | Approximate volume |
|---|---|
| 8 x 2-inch round | 6 cups |
| 8 x 1 1/2-inch round | 4 cups |
| 9 x 2-inch round | 8 cups |
| 13 x 9 x 2-inch rectangle | 14 cups |
Volumes are approximate and come from a standard baking-pan chart. Your own pans may differ slightly, so measure the inside edge to inside edge and check the depth with a ruler.
How Much to Scale a Recipe
Divide the volume of the pan you want to use by the volume of the pan in the recipe. For a 2-inch-deep 8-inch round (6 cups) going into a 2-inch-deep 9×13 (14 cups), that works out to a little more than twice the recipe.
That is an awkward multiple, so most bakers choose one of two practical routes:
- Double the recipe. The batter will fill a 9×13 to a shallower depth than the original, which is fine for sheet-style cakes, bars and brownies.
- Triple the recipe if you want a deeper cake close to the original batter depth and the pan is deep enough to hold it without overflowing.
Fill the pan no more than about two-thirds full for cakes that rise.
Adjusting the Baking Time
A pan with a larger area makes the batter shallower than in the original recipe. Heat reaches the center faster and more moisture evaporates, so the cake bakes sooner. When the batter is shallower, shorten the baking time and raise the oven temperature slightly, if needed, to avoid drying out the edges.
If the new pan makes the batter deeper than the original, do the opposite: lengthen the bake and lower the oven temperature slightly so the outside does not over-brown before the center sets.
Start checking early. Use a toothpick in the center, and look for pulled-away edges and a top that springs back when touched lightly.
Keeping the Same Batter Depth
The ideal swap keeps the same pan area, so the recipe’s baking time and temperature do not need to change. A 9×13 pan has far more area than a single 8-inch round, so no recipe written for one round will match it without scaling. If you need the same depth, scale up the batter instead of leaving the amount alone.
Other Ways to Use an 8-Inch Recipe
- Bake two 8-inch rounds as layers, or one round per day if you only need a small cake.
- Use a smaller square pan. An 8 x 8 x 2-inch square holds about 8 cups, which is closer to the 8-inch round.
- Cut an oversized 9×13 cake into portions and freeze extras, wrapped tightly.
Quick Answers
Can I pour a 6-cup recipe into a 9×13? Yes, but the cake will be thin and will bake faster. Check it well before the original time.
Can I use the original time? Only as a starting point. Begin testing earlier when the batter is shallower.
Do I need to change the temperature? Often not for a modest change, but a much shallower cake benefits from a slightly higher oven temperature, as long as it does not brown too fast.
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