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Old 07-23-2014, 09:47 PM   #1
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Cake Pan Capacity

Is this correct ....2 ...9 round cake pans holds 12 cups and a 13x9x2 pan that holds 14 cups is ok to use instead? Seems like the depth in the 13x9 would be less bec. Of only using 12 cups of batter?

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Old 07-23-2014, 10:00 PM   #2
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Is this correct ....2 ...9 round cake pans holds 12 cups and a 13x9x2 pan that holds 14 cups is ok to use instead? Seems like the depth in the 13x9 would be less bec. Of only using 12 cups of batter?
You are correct. There is a two cup difference in volume. The 13x9 is the closest substitution.
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Old 07-23-2014, 10:29 PM   #3
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Simply speaking, the round pans are nothing more than shallow cylinders, so I used the formula for calculating the volume of a cylinder to determine the volume of each pan.

That is:

Pi (3.14) times the radius (half the diameter) of the pan, squared, then multiplied by the height of the pan. 3.14 x 4.5 (squared), multiplied by 2. The volume of the each pan is 127.17.

Now...the volume of the rectangular pan is the length times the width, times the height, which is 234.

Now, that's just cubic inches, not cups, but it illustrates the volume differences in the pans. The combined volume of the two 9-inch pans would be 254.34, which is a bit more than the 9x13 pan at 234 cubic inches.

Okay, that's me. I'm very mathematically minded and solve many of my cooking/baking challenges this way.

An alternate method is to fill one of the round pans with water to about 1/4 inch from the top and measure how much water it contains, then do the same thing with the 9x13 pan. Simpler, but I somehow always reach for my pencil and paper.
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Old 07-23-2014, 11:06 PM   #4
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Katie's right if the 9" round pan is 2" high. The table I use gives volumes for 9"x1.5" and 9"x2". Two of the former = 12 cups and 2 of the latter = 16 cups. A 13"x9"x2" pan is right in the middle at 14 cups.

All this said, the 13"x9" rectangular pan is a standard substitution for 2x9" round pans. The differences are considered insignificant. After all, you don't fill any of these pans to the brim.
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Old 07-24-2014, 01:47 PM   #5
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Little confused... If my cake box yields only say 6 cups of cake batter, how much of a overhead do I need to be looking at. I could use a 8x8x2 which is. 8 cups,would that be ok to? How much is to much to use ....I feel 13x9 is 14 cups and seems for a 6 cup batter, that's way to much. I do understand this cup is volume pan holds and you never fill to the brim. Buy what is the best place to be for overhead. I hope I said this right.
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Old 07-24-2014, 02:12 PM   #6
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Old 07-24-2014, 02:19 PM   #7
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Thank you. But still I need to know how much clearance do I need if say have 6 cups and13x9 has 14 cups it still seems like a lot for just a 6 cup batter. Why do I need a 14 cup pan ? How do you pick ...couldn't I also use something higher? I know not to go to low bec. Of cake rising. But how high is to much. Again I hope that makes sense. Also 8x8x2 holds 8 cups would that be. Wrong?
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Old 07-24-2014, 02:23 PM   #8
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In general you want to fill cake pans to the half way mark. This gives room to rise and the right surface to center ratio for good texture.
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Old 07-24-2014, 03:05 PM   #9
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Quote:
Originally Posted by mumu View Post
Thank you. But still I need to know how much clearance do I need if say have 6 cups and13x9 has 14 cups it still seems like a lot for just a 6 cup batter. Why do I need a 14 cup pan ? How do you pick ...couldn't I also use something higher? I know not to go to low bec. Of cake rising. But how high is to much. Again I hope that makes sense. Also 8x8x2 holds 8 cups would that be. Wrong?
Your initial question was

Quote:
Originally Posted by mumu View Post
Is this correct ....2 ...9 round cake pans holds 12 cups and a 13x9x2 pan that holds 14 cups is ok to use instead? Seems like the depth in the 13x9 would be less bec. Of only using 12 cups of batter?
Now you're changing the subject to using a cake mix that has 6 cups of batter. It's pretty obvious that the 8x8 inch pan should be used for 6 cups of batter. So I don't understand what it is that you don't understand about this.
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Old 07-24-2014, 03:28 PM   #10
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Yes I just measured my cake mix and it gave me 6 cups. But been told to only half fill a pan so the 8x8x2 would only take 4 cups for it to be half full left with 2 cups
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