This is kind of a difficult question to answer with the information you have provided. Are you saying that you have a cake pan that is 30cm x 30cm? If so, how deep is the pan?
You need the third piece of information to figure volume. A cake mix that makes 24 cupcakes would produce approximately 5 to 5-1/2 cups of batter. There are 236.56 cubic centimeters per cup of liquid, so 5 cups of batter equates to 1182.80 cubic centimeters of batter.
A 25 x 25 x 5 cm pan can hold a volume of 3125 cubic centimeters. When you fill a cake pan, you don't fill the pan up to the top to bake it because it will rise as it bakes and you would end up with half the batter in the bottom of your oven. Fill the pan to about halfway, so you would need a pan that will hold double the volume of the batter.
The pan I referenced above would be large enough to bake the 24 cupcake batter because half the volume of the pan is 1562.50 cubic centimeters. So, to make a larger cake than the mix for the 24 cupcakes you would need a volume larger than 5 cups (which we established was 1182.80 cubic centimeters. The equations used to calculate the information are: Calculating volume of the pan - height times depth times width.
Calculating volume of mix - 1 fluid ounce = 29.57 cubic cm - 8 fluid ounces per cup x 29.57 = 236.56 - number of cups of batter x 236.56 = volume of batter I hope this answers your question.
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