Generally it depends on how deep (how many layers) your cake is. Standard serving size of a piece of cake is 1" x 2". Also depending on how large you want to cut your slices (sensible vs generous), a 7" round cake can serve anywhere from 6-10 people.
You should order for only 90% of your guests. Some people will not eat the cake. So again, only order for 90% - in your case that means 12 people or one cake box mix - or one 9 inch round/square cake.
It depends on how deep the cake pan is.
Approximately 1.5-2 inches of cake per person, so a rectangular cake about 15 inch by 30 inch cake or so.
A ten inch cake feeds about 12 people if you cut it in wedge like triangles, like a pizza. However if you go to wilton.com and look at the cutting guide, they say it feeds 38, realisticly, more like 30. That is if it is at least 2 layers. and those are uniform peices so everyone gets the same amout of cake. I like this way. it makes the cake go farther and no one eats half a piece and throws away the rest. and if people want more they can always go get another piece.
1/2 full
8 inches. there are 2.54 cm in an inch
Well, honey, it depends on the depth of the pan and the brand of cake mix you're using. Typically, one box cake mix is enough for a 9-inch round pan, so for a 14-inch pan, you might need at least two or three mixes to ensure your cake is nice and tall. Just follow the instructions on the box and adjust accordingly. Happy baking, darling!
at least halfway full. but not more than 2/3 full.
If it calls for a 9 inch springform pan which holds about 10 cups one may use: 1 (10-inch) round cake pan 1 (10-inch) springform pan 2 (8-inch) round cake pans 2 (9-inch) round cake pans If it call dor a 10 inch springform pan which holds about 12 cups one may use: 2 (8 x 4-inch) loaf pans 1 (9-inch) tube pan 2 (9-inch) round cake pans 1 (10-inch) Bundt pan 2 (11 x 7-inch) baking dishes 2 (8-inch) round cake pans
82.466
Preferably not, the tins that you use should have an added overall area of 81'' square (presuming your nine inch tins are square). Therefore the ten inch pan (if square) will be too big. Though if you don't mind a slightly thinner cake then it would be okay.
The farberware 9-inch cake round cake pan is the cheapest one. You can purchase this pan online for $6.95.