Wedding Cake Sizes: A Complete Guide

wedding cake with flowers and greenery

Photo by Janine Licare Photography

Your wedding day means sharing the most important celebration of your life with friends and family. It includes choosing a stunning venue, selecting beautiful blooms and décor, and, of course, coming up with an incredible food and drink menu that’s sure to please. Another important step? Of course, you can’t forget about the wedding cake!

Wedding cakes are such a wonderful tradition and for good reason. They can function as a piece of décor, a conversation starter, and a delicious treat all in one. Talk about the complete package!

But what’s one of the most important considerations when it comes to choosing your wedding cake? Certainly, the cake’s aesthetic is important. And of course, the flavor definitely matters. But before you dive into any of those details, the first step is to determine exactly what size of wedding cake you’ll need. And sometimes, it can be a little bit trickier than you might think.

Need help on where to start? We’ve got you covered. Read on for a complete guide to wedding cake sizes.

How to Determine Wedding Cake Size

When it comes to choosing a cake size, the first step is to consider your guest list. "Start by looking at the number of guests you are inviting," says Dominique Pickering, owner of Poppy Pickering Cake Design. "With regards to the number of portions, not everyone will wish for a piece of cake. Therefore, you do not need to cater to every guest. However, some guests may wish for seconds or wish to taste each flavor."

Meet the Expert

Dominique Pickering is the owner and creative designer behind Poppy Pickering Cake Design.

Typically, you can estimate the number of servings needed by approximating that 75 to 85 percent of those on your guest list will enjoy a piece of cake. Determine if you’d like to have enough cake to feed every guest, whether you’d like to have cake leftover, as well as consider what size of cake slice you plan to serve. Standard wedding cake servings are 1-inch by 2-inch slices. A larger party size slice is 1.5-inches by 2-inches. Many bakers offer cake tiers that are 4-inches or 5-inches tall, which should be factored into sizing calculations as well.

Your cake baker will work to inform you of the best sizing options and will help guide your choices.

Wedding Cake Sizes

Think about wedding cake sizing from top to bottom. Add up the number of servings a 6-inch top tier will provide, and then continue with the next cake size in order: 8-inch, 10-inch, 12-inch, and so on. For example, if you need 74 servings of cake, a three-tiered round wedding cake consisting of a 10-inch cake, an 8-inch cake, and a 6-inch cake would suffice.

Round Wedding Cake Sizing

  • Round 6-inch Cake: 12 servings
  • Round 8-inch Cake: 24 servings
  • Round 10-inch cake: 38 servings
  • Round 12-inch cake: 56 servings
  • Round 14-inch cake: 78 servings
  • Round 16-inch cake: 100 servings

Square Wedding Cake Sizing

  • Square 6-inch Cake: 18 servings
  • Square 8-inch Cake: 32 servings
  • Square 10-inch cake: 50 servings
  • Square 12-inch cake: 72 servings
  • Square 14-inch cake: 98 servings
  • Square 16-inch cake: 128 servings

Other Factors to Consider

Including Additional Desserts

Often, a wedding cake may serve as the main feature of a dessert table. But with the addition of a variety of treats such as cookies, brownies, cupcakes, and even candy, you may not need as much cake. Consider offering enough total dessert servings for all guests to enjoy one and a half items, whether it’s a slice of cake, a cookie, or a brownie.

Saving the Top Tier

It’s a tale as old as time! Saving the top tier of your wedding cake allows you to relive a momentous occasion on your first anniversary. If you plan to follow this timeless tradition, be sure to account for it when determining your wedding cake size. Don’t include the top tier when figuring out how much you need for a certain number of servings. Simply start your calculations with the next size down, often the 8-inch cake tier.

If you’re planning a wedding weekend, you may need to factor in more cake. An additional tier of cake can be added to allow for plenty of leftovers to enjoy at a following-day celebration.

Venue Size

Think about your venue size when choosing your cake size to be sure it’s proportionate. "For example, if the room is large with high ceilings, then a small-sized wedding cake might look a little lost and out of place," says Pickering. "Fake 'dummy' tiers can be combined with real tiers to add height and grandeur."

Decorations and Aesthetic

If you’re obsessed with a certain style of cake or method of decorating, you may need a larger cake size to pull off the look. "If the couple only requires a small-sized cake, then it might look out of proportion with lots of sugar decoration," offers Pickering. If it seems like the cake may look strange in proportion to any intricate decorations, increasing the size may help to balance out the details.

Service Style

The wedding cake may be cut and served during a sit-down dinner. Or, more often, it’s served after dinner and just before dancing. Consider your service style when determining cake size. If you’re planning to have a plated slice served to each guest while they’re still sitting, you’ll want to be sure you have enough cake to deliver that same slice to everybody. If you’re planning to cut the cake just before or in the middle of a dance party, chances are, not everybody on the guest list will head over
to the cake table to grab a bite.

When to Order a Wedding Cake

Baking and decorating elaborate wedding cakes is truly a specialized skill, and bakers fill their calendars up fast. Because of the time and attention to detail a wedding cake requires, bakers typically don’t take on many cakes at a time. If there’s a baker you love, be sure to begin discussing your cake eight months to one year from your wedding date. This will ensure you’ll get the sizing, flavor, and aesthetic you’ve been dreaming of.

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