The amount of cake needed to feed 30 people depends on several factors, such as the type of event, the serving size, and whether there are other desserts available. However, I can give you a general guideline for estimating the cake size:
Determine the serving size: Typically, a standard serving size for cake is around 1" x 2" x 4" (height x width x length). This size is commonly used for weddings and events.
Calculate the total volume: To find the total volume of cake needed, multiply the number of servings (30 people) by the volume of each serving (1" x 2" x 4" = 8 cubic inches). So, 30 servings x 8 cubic inches per serving = 240 cubic inches of cake.
Consider the shape: Cakes can come in various shapes, such as round, square, or rectangular. Depending on the shape you choose, the dimensions will differ, but the total volume should remain the same.
Choose a cake size: Based on the volume calculated (240 cubic inches), you can select a cake size that closely matches or slightly exceeds this volume. It's better to have a bit more cake than less to ensure all guests are adequately served.
Keep in mind that this is just an estimate, and if the event is formal or the only dessert option, you might want to consider a larger cake. It's also a good idea to consult with the bakery or cake provider, as they can guide you in selecting the appropriate cake size based on your preferences and event specifics.