Wedding Cake Size Calculator
How many tiers and what size do you need to feed every guest? Enter your guest count and portion style for a recommended cake configuration.
Dessert portions (1" × 2") are served as the main dessert course. Coffee portions (~30% smaller) work when cake is served alongside a dessert table or late in the night.
Recommended
3 tiers (classic)
Tiers: 12" / 9" / 6"
Serves ~100 guests (+0 buffer)
All tier options
Add an extra 10–15% to your count if you plan to save the top tier as tradition, or supplement with a smaller kitchen cake if you're over 200 guests.
Wedding cake serving chart
Standard round cake servings at dessert-size portions (1" × 2" wedge slices). For coffee-size portions, multiply any row by approximately 1.35.
| Round size | Dessert portions | Coffee portions |
|---|---|---|
| 6" round | 12 | ~16 |
| 8" round | 24 | ~32 |
| 9" round | 32 | ~43 |
| 10" round | 38 | ~51 |
| 12" round | 56 | ~76 |
| 14" round | 78 | ~105 |
| 16" round | 100 | ~135 |
To calculate total servings for a tiered cake, add the serving count for each tier together. For example, a 3-tier cake with 12", 9", and 6" rounds serves 56 + 32 + 12 = 100 dessert-size portions.
How wedding cake sizing works
Wedding cakes are sized by diameter and stacked in tiers for dramatic presentation. The number of people a tier can serve depends on the cake diameter and the size of each slice. The standard industry serving size is a 1-inch by 2-inch wedge — about the width of two fingers. This is the "dessert portion" used when cake is the main dessert course.
Coffee portions are roughly 30% smaller than dessert portions, so the same cake serves about 35% more guests when sliced for coffee. This works best when cake is served alongside a dessert table or later in the evening rather than as the main dessert course. Choose the smaller portion size if you have a large guest count and want a manageable cake without a separate kitchen cake.
Frequently asked questions
How many tiers do I need for 100 wedding guests?
For 100 guests with dessert-size portions, a 3-tier cake with 12-inch, 9-inch, and 6-inch round tiers serves approximately 100 people, making it the classic choice for weddings of this size. If you are serving coffee-size portions (roughly 30% smaller), a 2-tier 10/6 cake will usually cover 100 guests.
What size wedding cake do I need for 150 guests?
A 4-tier cake with 14-inch, 10-inch, 8-inch, and 6-inch rounds serves approximately 156 dessert-size portions, making it the right size for 150 guests. For coffee-size portions, a 3-tier 12/9/6 cake will usually cover 150 guests.
What is the difference between dessert and coffee portions?
Dessert portions are standard 1-inch by 2-inch wedge slices, served as the main dessert course. Coffee portions are roughly 30% smaller and are appropriate when cake is served alongside a dessert table or later in the evening as a sweet bite with coffee rather than a full dessert.
How many people does a 3-tier wedding cake serve?
A classic 3-tier cake with 12-inch, 9-inch, and 6-inch round tiers serves approximately 100 dessert-size portions, or about 135 coffee-size portions. A smaller 3-tier cake (10/8/6) serves about 70 dessert portions.
Should I save the top tier of my wedding cake?
Tradition holds that couples save the top tier to eat on their first anniversary. If you plan to do this, add 10–15% to your guest count when sizing the cake, or order a small separate kitchen cake to supplement the servings lost to tradition.