An 8-inch round cake serves about 20 party guests or 24 wedding guests, per Wilton’s serving chart, and a 9×13-inch sheet cake covers roughly 36 or 50.
The slice you plan to cut settles most of the argument. A 1½ × 2-inch party portion and a 1 × 2-inch wedding portion can swing a 12-inch round from 40 servings to 56. These tables come from Wilton’s charts for cakes about 4 inches tall, made from two 2-inch layers.
How Many People Does A Round Cake Feed?
Round cakes are celebration workhorses, and yield climbs fast with diameter because area grows with the square of the radius. Wilton puts a 6-inch round at 12 servings either way, while a 16-inch round reaches 77 party or 100 wedding servings.
The jump from 8 to 10 inches is the one bakers underestimate. An 8-inch round gives 20 party or 24 wedding portions; a 10-inch round gives 28 party or 38. Two inches of diameter buys eight more party slices or fourteen more wedding slices.
- A 9-inch round: 24 party, 32 wedding servings.
- A 12-inch round: 40 party, 56 wedding servings.
- A 14-inch round: 63 party, 78 wedding servings.
What Do Square And Sheet Cakes Serve?
Square and sheet cakes beat rounds on the same footprint because grid cutting wastes almost nothing. An 8-inch square yields 20 party or 32 wedding servings, and a 9 × 13-inch sheet yields 36 party or 50 wedding servings.
Wilton’s square-cake method starts the first cut about 2 inches in from the edge, then runs horizontal lines and portions roughly 1½ to 2 inches wide. The same grid applies to 11 × 15-inch and 12 × 18-inch sheet pans.
| Cake Size | Party Servings | Wedding Servings |
|---|---|---|
| 6-inch round | 12 | 12 |
| 8-inch round | 20 | 24 |
| 10-inch round | 28 | 38 |
| 12-inch round | 40 | 56 |
| 8-inch square | 20 | 32 |
| 10-inch square | 30 | 50 |
| 9 × 13-inch sheet | 36 | 50 |
| 12 × 18-inch sheet | 72 | 98 |
The full method and every size Wilton publishes live in Wilton’s cake serving chart.
Why Do The Two Columns Disagree?
The columns describe different slices, not different cakes. A party portion is the larger 1½ × 2-inch cut, sized for cake as the main dessert. The wedding portion is 1 × 2 inches, sized for cake served alongside other sweets.
King Arthur Baking’s wedding guide shows this in real planning: its 100-guest example used a decorated 6-inch and 8-inch two-tier display cake backed by two 9 × 13-inch sheet cakes, counting each sheet at 48 guests. That combination is one worked example, but it shows the tier providing the photo moment while the sheets feed the room.
Pick your column by the dessert table, not the event label. If cookies and pie are already out, plan on wedding portions. If cake is the only sweet thing in the room, use party portions.
What Throws Serving Counts Off?
The charts assume a cake roughly 4 inches tall from two 2-inch layers, and that height matters more than most bakers realize. A shallow or single-layer cake cut into the same footprint yields fewer substantial pieces.
Other real-world drift:
- Trimming domed tops and leveling layers removes cake before serving.
- Fondant, thick buttercream, and structural supports eat into usable volume.
- Children take smaller pieces; guests taking seconds take more.
- A 9 × 13-inch pan does not guarantee Wilton’s 36 and 50 — other cutting conventions land elsewhere.
Wilton states plainly that actual results vary, so treat every count as an estimate and round up when the guest list is firm. If you’re weighing the cake’s base against your table, a look at the top-rated cake stands for large tiers helps you match board width to stand surface before delivery day.
Reaching The Right Number
Decide the slice style, then size the cake to the count instead of guessing from the pan in the cupboard.
- Count confirmed guests and add a small buffer for seconds.
- Choose wedding portions if other desserts are served, party portions if cake stands alone.
- Match the guest count to Wilton’s party or wedding column for your pan shape.
- Split the load across a display tier and a sheet cake when the list is long.
- Check cake height before trusting the chart, and round up if it falls short of 4 inches.
For a stand, confirm the top surface is at least as wide as the cake board; for tiered cakes, make sure it carries the full bottom tier, boards, decorations, and supports without wobbling.
FAQs
Does A Taller Cake Serve More People?
Yes, up to a point. Wilton’s chart assumes about 4 inches of height from two 2-inch layers, so a cake built to that depth yields the published counts. A taller cake can be cut into the same footprint with thicker slices or a separate upper tier, but a shallow single-layer cake will generally produce fewer substantial portions than the chart lists.
Should I Order A Tiered Cake Or A Sheet Cake?
It depends on whether the cake needs to be seen or just served. King Arthur Baking’s 100-guest example paired a two-tier display cake with two 9 × 13-inch sheets, using the tier for presentation and the sheets for volume. Sheet cakes are easier to cut evenly and cost less per serving.
How Wide Should The Cake Board Be?
The board should match or slightly exceed the cake’s diameter so the frosting edge stays supported. The stand’s usable top surface then needs to be at least as wide as that board. For tiered cakes, the stand must support the full bottom tier and stay stable under the combined weight of cake, boards, and decorations.
References & Sources
- Wilton. “Ultimate Cake Serving Chart.” Source for all party and wedding serving counts, slice dimensions, and the square-cake cutting method.
- Wilton. “Wedding Cake Guide.” Two-layer round and square wedding serving figures.
- King Arthur Baking. “Cake Guide.” Worked 100-guest tier-and-sheet-cake example.