What Size Wedding Cake Do You Need?
How to size a wedding cake by guest count — tier sizes, how many servings each tier gives, the sheet-cake hack for big weddings, and a free cake calculator.
Try the Wedding Cake CalculatorWedding cakes are sized by servings, not by how big they look. Bakers cut standard wedding slices at about 1 inch by 2 inches, and each round tier yields a known number of those slices. Match the total to your guest count and you have your cake.
Servings per tier
| Tier (round) | Standard servings |
|---|---|
| 6 inch | ~12 |
| 8 inch | ~24 |
| 10 inch | ~38 |
| 12 inch | ~56 |
| 14 inch | ~78 |
| 16 inch | ~100 |
Stack tiers two inches apart for a balanced look. A 6+8+10 three-tier cake serves about 74; an 8+10+12 serves about 118. Pick the smallest stack that covers your guests — the calculator does this for you and estimates the cost:
Recommended cake
3-tier
Estimated cost
$354–$708
118 servings
| Tier | Serves |
|---|---|
| 8" round | 24 |
| 10" round | 38 |
| 12" round | 56 |
Serves your 100 guests with 18 slices to spare.
Serving counts use standard 1"×2" wedding slices. Cost is a national estimate; fondant and intricate designs run higher, and your baker's per-serving quote is the final word.
The sheet-cake hack for big weddings
For large guest counts, a towering tiered cake gets expensive fast. The common trick: display a smaller decorated tiered cake for photos and the cutting, then serve guests from a plain sheet cake cut in the kitchen. It tastes identical and costs far less per slice.
Budgeting for the cake
Cakes are usually priced per serving. As a rough national guide, buttercream runs about $3–$6 a slice and fondant $5–$9, so a 100-serving cake lands around $300–$900 depending on style and detail. Your baker’s per-serving quote is the number that matters.
Working out the rest of the menu? The catering calculator handles food quantities, and the alcohol calculator covers the bar.
Frequently asked questions
How many tiers should a wedding cake have?
Most weddings use a two- to four-tier cake. Two tiers suit up to ~60 guests, three tiers up to ~100, and four tiers up to ~130. Beyond that, pair a smaller display cake with a sheet cake.
Does everyone eat wedding cake?
Not always, but it's safest to plan one slice per guest — leftovers keep well and running out doesn't. If you're serving a separate dessert too, you can size the cake for about 75–80% of guests.
Why is fondant more expensive than buttercream?
Fondant takes more labor to roll, drape, and finish smoothly, so bakers charge more per serving — typically $5–$9 versus $3–$6 for buttercream.