This depends on several factors including:

Whether you're serving your cake on its own or along side other goodies.
Whether you're serving the cake to adults or children.
What kind of effect you're looking for - you may end up with much more cake than you need in order to have the four tier, themed character cake for your little one's third birthday that you've got your heart set on! But they're only three once...

We'll discuss all this and more to ensure we have your priorities in order, so we can get the balance just right for your celebration.