How many calories in a piece of carrot cake?

It depends a lot on factors of the cake, such as icing, layers, fillings, decorations (sprinkles, shaved chocolate, piping, ect.) and they type of cake (Milk Chocolate, Baking Chocolate, dark chocolate, ect.). Generally, a small slice of fairly simple and plain chocolate cake will be about 200 calories. A large slice can be about 400 calories. But a more complex cake can be up to 700 or 800 calories a slice.