How Much Wedding Cake Do You Need for Your Guest Count?

The amount of cake you need depends on how you plan to serve it. A standard wedding cake portion is about the size of a finger, roughly 2.5 cm by 5 cm. This is smaller than a slice from a shop-bought cake, because wedding cakes are rich and often served after a meal.

For a dessert portion, you can double that size, but most couples serve cake as an evening treat. If you also have a dessert table or other sweets, you can serve smaller portions. As a rule, plan for one standard portion per guest, plus a little extra for seconds or for guests who want a larger slice.

For 50 guests, a two-tier cake usually works well. A 20 cm (8 inch) bottom tier and a 15 cm (6 inch) top tier will give you around 50 to 60 standard portions. If you want a taller look, you can add a small top tier for display only, but make sure the baker knows it is not for serving.

For 100 guests, a three-tier cake is the classic choice. A 25 cm (10 inch) bottom tier, a 20 cm (8 inch) middle tier and a 15 cm (6 inch) top tier will give you roughly 100 to 120 portions. This is the most common size for a wedding with around 100 guests.

For 150 guests, you will need a four-tier cake or a three-tier cake with a larger bottom tier. A 30 cm (12 inch) bottom tier, 25 cm (10 inch) second tier, 20 cm (8 inch) third tier and 15 cm (6 inch) top tier will give you around 150 to 170 portions. If you prefer a three-tier cake, ask your baker to make the bottom tier larger, such as 30 cm, 25 cm and 20 cm, which will give you roughly 130 to 150 portions. Always confirm the exact servings with your baker, because tier depths vary.

A simple way to estimate portions is to think in terms of cake area. Each standard portion needs about 12.5 square cm of cake surface. For a round tier, the area is roughly the diameter multiplied by itself, then multiplied by 0.8. For example, a 20 cm tier gives about 320 square cm, which is around 25 portions. A 25 cm tier gives about 500 square cm, which is around 40 portions. A 30 cm tier gives about 720 square cm, which is around 57 portions.

For square tiers, the area is the side length multiplied by itself, and you can get about 20 percent more portions than a round tier of the same size. So a 20 cm square tier gives around 30 portions, a 25 cm square gives around 48, and a 30 cm square gives around 68.

To work out your total, add the portions from each tier. For 50 guests, you might choose a 20 cm round and a 15 cm round, which gives about 25 plus 15, so 40 portions. That is a bit short, so go up to a 20 cm and a 18 cm round, or add a small 10 cm top tier. For 100 guests, a 25 cm, 20 cm and 15 cm round gives about 40 plus 25 plus 15, so 80 portions. That is also short, so you might need a 28 cm bottom tier instead. Always round up, and ask your baker for their exact portion guide.

The best way to cut a wedding cake is to remove the top tier first if you want to save it, then cut the lower tiers into slices. Use a long, sharp knife and a clean cloth to wipe the blade between cuts. For round tiers, cut a circle about 5 cm from the edge, then slice that ring into pieces. Continue cutting inner rings until you reach the centre.

For square tiers, cut straight lines across the cake to make rows, then slice each row into fingers. This gives neat, even portions and is easier than cutting wedges. If you have a tiered cake with supports, remove each tier carefully before cutting. Your caterer or venue may offer to cut and serve the cake, so ask in advance. If you are doing it yourself, allow about 10 minutes for a two-tier cake and 20 minutes for a four-tier cake.

Order your wedding cake at least three to six months before the wedding. Popular bakers book up quickly, especially for summer dates. If you are having a bespoke design, you may need even more time for consultations and tastings. Confirm the delivery date and time with your baker, and make sure someone is available to receive the cake at the venue.

If you are having a simple cake from a supermarket or local bakery, you can order a few weeks ahead, but still confirm the date and collection time. Always check the venue's rules about outside food and whether they charge a cake cutting fee. Some venues include cake service in their package, so ask your venue coordinator.

Most wedding cakes with fresh cream, custard or fruit fillings need to be kept in a fridge until a few hours before serving. Buttercream and fondant cakes can usually sit at room temperature, but they should be kept away from direct sunlight and heat. Ask your baker for specific storage advice, because it depends on the filling and the weather.

If your cake needs refrigeration, make sure the venue has space in their kitchen fridge. Take the cake out about two to three hours before cutting to let it come to room temperature, which improves the flavour and makes cutting easier. If you are saving the top tier, wrap it tightly in cling film and foil, then freeze it as soon as possible after the wedding.

No, a cake topper is optional. Many couples choose a simple floral decoration, fresh flowers, or a personalised topper with their names or initials. Others prefer a naked cake with fruit or a minimalist design with no topper at all. Your cake should reflect your style and the theme of your wedding.

If you do want a topper, make sure it is food-safe and suitable for the cake's surface. Fresh flowers must be pesticide-free and placed on a food-safe barrier, such as a small disc or a layer of icing. Tell your baker about any topper you plan to use, so they can advise on how to place it safely.