9" round. First attempt at cake with no eggs or milk and the layers did not rise well so ended up with three layers. Top two stayed together, bottom... well you can see. I was lazy that week and used a store bought premade cake frosting (not Wilton) and as you can see it did not hold up well at all. When I got to class my cake needed to be iced already, and it was, but it had separated and cracked before class even started. So I spent the first 30 minutes reconstructing it. Then the icing for my roses was too soft, so they kind melted on top the cake by the time I got it home. Cake looked half decent when I left class, but I didn't have my camera. When I got home..... So lesson learned... don't use store bought icing for roses, and make sure your layers are secure. Wish I had known about that dowel trick for this cake. It also helps if it isn't sitting in a hot car on the way home either.