hi I need one birthday cake for 75 people can you please give me a idea how many big cake and how much should will be

They take orders on their website. I think you can specify how many servings.

I would ask them if they make a sheet cake that would serve that number of guest.

$:45.oo Chocolate Cake in which you can Cut 8 pieces , that means you need 10 Cakes for 75 peoples . It will Cost you $:450.oo , my advice is that Call them or go their and talk to them they may be able to give you a better deal . Good Luck.

I would go in and ask them, they'll tell you how big of a cake you will need.