Country Kitchen SweetArt sells buttercream icing that is made up, ready to use. For best results, mix buttercream icing on low for a few minutes before icing the cake. It tastes wonderful and comes in 3 convenient sizes. The 3 1/2 lb. tub= 7 cups. The 8 lb. tub= 16 cups. The 25 lb. tub= 50 cups.
The chart above is for the amount of icing needed to cover each size cake.