Cake servings = the top area of the cake ÷ the footprint of one slice. Wilton's chart uses party slices of about 1½ × 2 in (3 in²) and wedding slices of 1 × 2 in (2 in²) on cakes 4 in tall. A 9 × 13 sheet serves about 39 party slices by area, and Wilton lists 36. For 50 guests, an 11 × 15 sheet or a 14-inch round is enough.
How to use the cake servings calculator
- Pick the shape: round, square, rectangle/sheet or tiered.
- Enter the pan size in inches: the diameter for a round, the side for a square, width and length for a sheet, or each tier's diameter separated by commas.
- Choose party (1½ × 2 in) or wedding (1 × 2 in) slices.
- Read the number of servings and the top area.
- Open What size cake for my guests? and enter your head count to get the smallest sheet or single round that covers it.
How cake servings are calculated
- Round: area = π × (diameter ÷ 2)². An 8-inch round is 50.3 in².
- Square: area = side². Sheet: area = width × length.
- Servings = area ÷ 3 in² (party) or ÷ 2 in² (wedding), rounded down to whole slices.
- Tiered: each tier is worked out separately and the servings are added.
Area math assumes every square inch becomes cake on a plate. Real cutting loses a little at curved edges, and Wilton's own counts, which come from its test kitchen, differ from pure area in places. Both are shown below so you can choose.
Worked examples
- Birthday for 50, party slices: the smallest sheet that covers it is 11 × 15 in (55 slices); the smallest single round is 14 in (51 slices).
- Three-tier wedding cake, 6 + 8 + 10 in: 14 + 25 + 39 = 78 wedding slices by area. Wilton's chart gives 12 + 24 + 38 = 74.
- Office cake in a 9 × 13 pan: 39 party or 58 wedding slices by area if it is two layers tall. As a single 2-inch layer, Wilton's height rule halves its chart figure to 18 party servings.
Round cake servings
| Round pan | Party (1.5×2) | Wedding (1×2) |
|---|---|---|
| 6 in | 9 | 14 |
| 8 in | 16 | 25 |
| 9 in | 21 | 31 |
| 10 in | 26 | 39 |
| 12 in | 37 | 56 |
| 14 in | 51 | 76 |
Sheet cake sizes and servings
| Size | Dimensions | Party (1.5×2) | Wedding (1×2) |
|---|---|---|---|
| 7×11 sheet | 7 × 11 in | 25 | 38 |
| 9×13 sheet | 9 × 13 in | 39 | 58 |
| 11×15 sheet | 11 × 15 in | 55 | 82 |
| 12×18 sheet | 12 × 18 in | 72 | 108 |
Area method vs Wilton's cake serving chart
Wilton's published servings for 4-inch-tall cakes, next to the area calculation, with Wilton's batter quantity for one 2-inch layer:
| Pan | Party: area / Wilton | Wedding: area / Wilton | Batter per layer (cups) |
|---|---|---|---|
| 6 in round | 9 / 12 | 14 / 12 | 2¼ |
| 8 in round | 16 / 20 | 25 / 24 | 4 |
| 9 in round | 21 / 24 | 31 / 32 | 5 |
| 10 in round | 26 / 28 | 39 / 38 | 6 |
| 12 in round | 37 / 40 | 56 / 56 | 8 |
| 14 in round | 51 / 63 | 76 / 78 | 11½ |
| 16 in round | 67 / 77 | 100 / 100 | 16 |
| 6 in square | 12 / 12 | 18 / 18 | 3 |
| 8 in square | 21 / 20 | 32 / 32 | 6 |
| 10 in square | 33 / 30 | 50 / 50 | 9 |
| 12 in square | 48 / 48 | 72 / 72 | 11½ |
| 14 in square | 65 / 63 | 98 / 98 | 16 |
| 16 in square | 85 / 80 | 128 / 128 | 22 |
| 7×11 in sheet | 25 / 24 | 38 / 32 | 5½ |
| 9×13 in sheet | 39 / 36 | 58 / 50 | 10 |
| 11×15 in sheet | 55 / 54 | 82 / 74 | 11½ |
| 12×18 in sheet | 72 / 72 | 108 / 98 | 16 |
The pattern: Wilton's party counts for rounds run higher than area (8 in: 20 vs 16), its sheet-cake wedding counts run lower (9×13: 50 vs 58), and its square wedding counts match area exactly. Wilton notes its numbers are a guide only and actual results vary.
Tiered wedding cake servings
| Tiers | Wedding slices |
|---|---|
| 6″ + 8″ | 39 |
| 6″ + 9″ + 12″ | 101 |
| 6″ + 8″ + 10″ | 78 |
| 6″ + 8″ + 10″ + 12″ | 134 |
| 8″ + 10″ + 12″ + 14″ | 196 |
What size cake for my guests?
The smallest single sheet or round (by area) that covers each head count:
| Guests | Sheet, party | Sheet, wedding | Round, party | Round, wedding |
|---|---|---|---|---|
| 12 | 7×11 | 7×11 | 7 in | 6 in |
| 20 | 7×11 | 7×11 | 9 in | 8 in |
| 30 | 9×13 | 7×11 | 12 in | 9 in |
| 40 | 11×15 | 9×13 | 14 in | 12 in |
| 50 | 11×15 | 9×13 | 14 in | 12 in |
| 75 | 2+ sheets | 11×15 | use tiers | 14 in |
| 100 | 2+ sheets | 12×18 | use tiers | 16 in |
What changes the number of servings
- Slice size. Wilton says serving size depends on the cake's shape and on who is doing the cutting. Generous cutters get fewer slices than the chart.
- Height. Per Wilton, cakes 3–6 inches tall in the same pan give the same servings, and cakes under 3 inches give half.
- Shape. Squares and sheets cut into a clean grid; rounds do not divide into a perfect grid, so area counts and chart counts differ more for rounds.
- Pan names. "Quarter sheet" and "half sheet" are not fixed sizes. Always compare actual inches.
Common mistakes
- Mixing up the columns. Wedding counts assume thin 1 × 2 in slices. If your guests will expect party-size portions, plan from the party column or you will run short.
- Counting a single-layer cake as two layers. Halve the chart servings for anything under 3 inches tall.
- Forgetting the tier you keep. If you plan to save a tier, subtract its servings from the total.
- Cutting to zero. Round up to the next pan size if you want a margin for second helpings.
Frequently asked questions
How many people does a 9×13 sheet cake feed?
By top area, about 39 party slices (1.5×2 in) or 58 wedding slices (1×2 in). Wilton's chart for a 4-inch-tall 9×13 lists 36 party or 50 wedding servings.
How big is a quarter sheet cake?
There is no official size. Bakeries use 'quarter sheet' for different pans, most often around 9×13 in, so ask your bakery for the actual dimensions. Wilton, whose serving chart we use, names its pans by size (7×11, 9×13, 11×15, 12×18 in) rather than as quarter or half sheets.
What size cake do I need for 50 people?
An 11×15 in sheet cake (55 party slices by area; Wilton lists 54) or a three-tier 6-8-10 in round cake (78 wedding slices by area; Wilton lists 12 + 24 + 38 = 74).
How big is a half sheet cake?
The name isn't standardized, so check the actual size. Wilton's large sheet pans are 11×15 in and 12×18 in: an 11×15 serves about 54 party or 74 wedding servings and a 12×18 about 72 party or 98 wedding (Wilton chart, 4 in tall). By area, the calculator gives 55 / 82 and 72 / 108.
How many does an 8 inch round cake serve?
By top area, about 16 party slices (1.5×2 in) or 25 wedding slices (1×2 in). Wilton's chart lists 20 party and 24 wedding servings for a 4-inch-tall, two-layer 8-inch round.
How many does a 10 inch round cake serve?
By top area, about 26 party or 39 wedding slices. Wilton's chart lists 28 party and 38 wedding servings for a 4-inch-tall 10-inch round.
What size cake for 100 guests?
One 12×18 sheet gives 108 wedding slices by area (Wilton lists 98), or a four-tier 6-8-10-12 in round cake gives 134 wedding slices by area. For party-size slices you would need more than one large sheet.
Does a taller cake serve more people?
Not by Wilton's method. Its chart says cakes 3 to 6 inches high in the same size pan yield the same number of servings, because they are cut the same way. Cakes shorter than 3 inches yield half the servings listed.
How many servings in a single-layer sheet cake?
Wilton says cakes shorter than 3 inches yield half the chart servings. Its 9×13 lists 36 party servings at 4 inches tall, so a single 2-inch layer serves about 18.
How much batter for a 9×13 pan?
Wilton's chart lists 10 cups of batter for one 2-inch layer in a 9×13 pan, and recommends filling pans ½ to ⅔ full.
What is the difference between party and wedding slices?
Wilton bases party servings on slices of about 1½ × 2 inches and wedding servings on slices of about 1 × 2 inches, both from a 4-inch-tall cake. A wedding slice is two-thirds the footprint of a party slice, so the same cake serves about 50% more.
Sources & method
- Wilton — Ultimate cake serving chart (party 1½×2 in, wedding 1×2 in, 4 in high; batter per pan; height rule)
- Wilton — 9×13 in sheet cake pan
- Wilton — 11×15×2 in sheet cake pan
Results are estimates for general information. Found an error? It helps everyone — see our methodology.