full sheet cake how many servings
A quick guideline for servings follows: 1  A 1/4 Sheet Cake Pan is 9 by 12 inches, which will usually serve 12 to 20 people. 2  A 1/2 Sheet Cake Pan is 11 by 15 inches, which will usually serve 18 to 40 people.  A full Sheet Cake Pan is 18 by 24 inches, which will usually serve 48 to 96 people. This is a fabulous event cake for charities and grand company celebrations.