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 |
Heart, petal, hexagon and oval cake servings
Shaped pans don't divide into a clean grid, so area math overstates them. For these, use Wilton's published counts for 4-inch-tall, two-layer cakes rather than the calculator. Note how the shape changes the yield: an 8-inch round serves 20 party slices, but an 8-inch heart only 18, and a 9-inch petal only 14, because the lobes leave narrow wedges that are too small to plate.
| Shape | Size | Party | Wedding | Batter per 2 in layer (cups) |
|---|---|---|---|---|
| Heart | 6 in | 8 | 14 | 2 |
| Heart | 8 in | 18 | 22 | 4 |
| Heart | 9 in | 20 | 28 | 4¼ |
| Heart | 10 in | 24 | 38 | 6½ |
| Heart | 12 in | 24 | 56 | 9¼ |
| Heart | 14 in | 48 | 72 | 13½ |
| Heart | 16 in | 64 | 94 | 17 |
| Petal | 6 in | 6 | 8 | 1½ |
| Petal | 9 in | 14 | 18 | 3¾ |
| Petal | 12 in | 38 | 40 | 7¼ |
| Petal | 15 in | 48 | 64 | 10⅔ |
| Hexagon | 6 in | 10 | 12 | 2 |
| Hexagon | 9 in | 20 | 26 | 4½ |
| Hexagon | 12 in | 34 | 40 | 8 |
| Hexagon | 15 in | 48 | 70 | 14 |
| Oval | 7.75 × 5.5 in | 9 | 13 | 2¾ |
| Oval | 10.75 × 7.8 in | 20 | 26 | 5 |
| Oval | 13.5 × 9.8 in | 30 | 45 | 8¼ |
| Oval | 16.5 × 12.4 in | 44 | 70 | 13¼ |
How much frosting and batter, and how long to bake
Wilton's chart pairs each pan with the batter for one 2-inch layer, an oven temperature, a bake time and a rough frosting quantity. It stresses that your recipe's temperature and time come first: ovens and altitude vary, so check for doneness at the shortest time listed. Its buttercream amounts cover a smooth coat plus a simple top and bottom border. Piped flowers, ruffles or a filling between layers need more. For any pan 3 inches deep and 12 inches across or larger, Wilton recommends a heating core so the center bakes through before the edges dry out. To convert oven temperatures, use the Celsius to Fahrenheit converter. For batter cups in millilitres, try the mL to oz converter.
| Pan | Oven | Minutes per layer | Icing to ice & decorate (cups) |
|---|---|---|---|
| 6 in round | 350°F | 35–40 | 2½ |
| 8 in round | 350°F | 37–42 | 3½ |
| 10 in round | 350°F | 40–45 | 5 |
| 12 in round | 350°F | 40–45 | 6 |
| 14 in round | 325°F | 50–55 | 8½ |
| 8 in square | 350°F | 45–50 | 4½ |
| 10 in square | 350°F | 50–55 | 6 |
| 12 in square | 325°F | 55–60 | 7½ |
| 7 × 11 in sheet | 350°F | 45–50 | 5 |
| 9 × 13 in sheet | 350°F | 40–45 | 7 |
| 11 × 15 in sheet | 325°F | 50–55 | 9 |
| 12 × 18 in sheet | 325°F | 55–60 | 11 |
3-inch-deep pans
Wilton bases its 3-inch figures on a single layer that is split (torted) and filled to reach 3 inches, with the pan filled only half full. Because 3- to 6-inch cakes are cut the same way, a 3-inch 10-inch round still serves 28 party or 38 wedding slices, the same as a two-layer 4-inch cake.
How to cut a round cake so the chart numbers work
Wedding counts only come true if the cake is cut in rings rather than wedges. Wilton's method for rounds 8 inches and up:
- Cut a circle about 2 inches in from the outer edge.
- Slice that outer ring into pieces about 1½ inches wide.
- Cut another 2-inch ring and slice it the same way. Repeat until a 6-inch cake is left in the middle.
- Cut the 6-inch core into 12 wedges, or smaller for tasting portions.
Wedges from the center are far bigger than 1 × 2 in, so a round cut like a pie gives much less than the chart. If whoever cuts the cake won't follow a ring pattern, plan from the party column or choose the next pan up.
How many cakes do I need?
Once you know the servings per cake, divide the head count by it and round up. The widget does this in the guest panel for whatever pan you entered. For example, 120 guests with 9 × 13 sheets at party size is 120 ÷ 39 = 3.1, so bake 4 sheets. Mixed sizes work too: one 12 × 18 sheet (72 party slices) plus one 11 × 15 (55) covers 120 with 7 to spare.
Custom slices change everything. A 2 × 2 in square (4 in²) is a third bigger than Wilton's party slice. That cuts a 9 × 13 sheet from 39 servings to 29, and a 3 × 3 in slice to 13. Pick Custom size in the widget and the pan finder and the bar chart update to match. If you save the top tier of a wedding cake, count it out of the total, and use the anniversary calculator to see when that first anniversary falls.
Keeping the cake safe on the day
Buffet cakes sit out for a long time, and the frosting decides how long is safe. The U.S. Food and Drug Administration lists cakes with whipped-cream and cream cheese frostings among the creamy desserts that should be kept refrigerated. The CDC's rule for perishable food is to refrigerate it within 2 hours, or within 1 hour if it is above 90°F, as at an outdoor summer party, and to keep the fridge at 40°F or below. In practice, keep cream-frosted cakes chilled until shortly before cutting, and put leftovers away as soon as serving ends. For a long reception, a smaller display cake plus kitchen-cut sheet cakes keeps most of the cake cold.
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.
How many people does a heart-shaped cake serve?
Wilton's chart lists 18 party or 22 wedding servings for an 8-inch heart and 24 party or 38 wedding servings for a 10-inch heart, both 4 inches tall. A heart serves fewer people than a round of the same size because its pointed end and lobes waste more cake when cut.
How much frosting do I need for an 8 inch cake?
Wilton's chart lists about 3½ cups of icing to ice and decorate a two-layer, 4-inch-tall 8-inch round, and 4½ cups for an 8-inch square. It says these amounts cover a crumb coat plus simple top and bottom borders, so allow more for detailed piping.
How do you cut a round cake into wedding slices?
Wilton's method: cut a circle about 2 inches in from the outer edge, slice that outer ring into pieces about 1½ inches wide, and keep cutting 2-inch rings until a 6-inch core remains. Cut the 6-inch core into 12 wedges.
How long can a cake sit out at a party?
Cakes with cream cheese or whipped-cream frosting belong in the fridge. The FDA lists them among creamy desserts to keep refrigerated, and the CDC says to refrigerate perishable food within 2 hours, or within 1 hour above 90°F. Plain buttercream and fondant cakes are not covered by that guidance, so follow your recipe.
What if my slices are bigger than party size?
Choose Custom size and enter your slice width and length. A 2 × 2 in slice is 4 in², so a 9 × 13 sheet (117 in²) gives 29 slices instead of 39 party slices.
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
- Wilton — How to cut a round cake
- CDC — Four steps to food safety (refrigerate within 2 hours, 1 hour above 90°F)
- U.S. FDA — Holiday goodies: cakes with whipped-cream and cream cheese frostings
Results are estimates for general information. Found an error? It helps everyone — see our methodology.