A standard wedding cake serving is a slice 1 inch wide, 2 inches deep and about 4 inches tall. Using that size, a 6-inch round tier serves about 14 people, an 8-inch round about 25, and a 10-inch round about 39. Square tiers serve more than round tiers of the same width, because they have more cake in the corners.
The charts below give servings for common round, square and sheet sizes, at both wedding and party slice sizes. Every number is worked out from the size of the cake, not guessed.
Wedding slice vs party slice
Bakers use two standard serving sizes. Which one you choose changes the number of servings a lot, so decide this first.
| Slice | Size (width × depth × height) | Top area | Best for |
|---|---|---|---|
| Wedding slice | 1 × 2 × 4 inches | 2 square inches | Weddings with a full meal before dessert |
| Party slice | 1.5 × 2 × 4 inches | 3 square inches | Birthdays, showers, or when cake is the main dessert |
A party slice is 50% bigger, so the same cake gives about two-thirds as many party servings as wedding servings. If your guests will have had a big dinner, wedding slices are usually plenty. If the cake is the main sweet of the night, plan party slices.
Round wedding cake servings chart
Round tiers are the classic wedding cake shape. The servings below assume a standard tier about 4 inches tall, made of two layers with filling.
| Round tier | Wedding servings | Party servings |
|---|---|---|
| 6-inch | 14 | 9 |
| 8-inch | 25 | 16 |
| 10-inch | 39 | 26 |
| 12-inch | 56 | 37 |
| 14-inch | 76 | 51 |
| 16-inch | 100 | 67 |
The jump between sizes is bigger than it looks. A 12-inch round isn’t twice the cake of a 6-inch round. It’s about four times as much, because the area grows with the square of the width.
Square wedding cake servings chart
Square tiers have straight sides and corners, so they hold more cake than a round tier of the same width.
| Square tier | Wedding servings | Party servings |
|---|---|---|
| 6-inch | 18 | 12 |
| 8-inch | 32 | 21 |
| 10-inch | 50 | 33 |
| 12-inch | 72 | 48 |
| 14-inch | 98 | 65 |
| 16-inch | 128 | 85 |
If you like the look of square tiers, you can often use a smaller cake to feed the same number of people. A 10-inch square gives about as many servings as an 11 to 12-inch round.
Sheet cake servings chart
Sheet cakes are flat, rectangular cakes baked in standard pans. They’re often served from the kitchen alongside a smaller display cake. The servings below are for a two-layer sheet, about the same height as a tier.
| Sheet | Size | Wedding servings | Party servings |
|---|---|---|---|
| Quarter sheet | 9 × 13 in | 58 | 39 |
| Half sheet | 12 × 18 in | 108 | 72 |
| Full sheet | 18 × 24 in | 216 | 144 |
A single-layer sheet, about 2 inches tall, is half as tall as a tier. To give each guest the same amount of cake, each serving needs twice the top area, so a single-layer sheet gives about half the servings shown here.
How the servings are calculated
The method is simple, which is why it’s reliable:
- Work out the top area of the tier. For a round tier, that’s π × (half the width)². For a square tier, it’s the width × the width.
- Divide by the top area of one slice: 2 square inches for a wedding slice, 3 for a party slice.
- Round down, because you can’t serve part of a guest.
For example, a 10-inch round tier has a top area of about 78.5 square inches. Divided by 2, that’s about 39 wedding slices.
Real cutting isn’t perfectly efficient. Round cakes leave small curved pieces at the edges, and the person cutting may not be exact. That’s one reason to plan a few extra servings.
How to cut a tiered cake so the servings work
The charts only work if the cake is cut the way they assume. Many venues and caterers know this method, but it’s worth checking with whoever will cut your cake.
Round tiers. Remove the tier from its board and supports. Cut a circle about 2 inches in from the outside edge, all the way around. Then cut that outer ring into slices about 1 inch wide. Now you have a smaller round in the middle. Cut another circle 2 inches in, slice that ring, and keep going until the center is small enough to cut into pieces.
Square tiers. Cut straight across the tier 2 inches from one edge. Slice that strip into 1-inch pieces. Repeat across the cake.
Sheet cakes. Cut a grid. For wedding slices, cut rows 2 inches apart one way and 1 inch apart the other way.
If the person cutting simply slices wedges like a birthday cake, you’ll get far fewer servings than the chart shows. Wedges are much bigger than a 1 × 2-inch wedding slice, so a tier planned for about 39 servings can run out long before every guest is served.
Other shapes and mixed tiers
Hexagon, heart and petal shapes look lovely, but they don’t follow simple formulas, and their servings depend on the exact pan. Ask your baker for the serving count of each tier.
You can also mix shapes, for example a square base with round tiers on top. Just add up the servings for each tier from the right chart. Mixing tier sizes works the same way: a cake doesn’t need even steps, so a 6, 9 and 12-inch round is fine if it gives you the number you need and looks right to you.
Height matters too. A “double-barrel” tier, which is roughly twice as tall as a standard tier, holds about twice the cake. Bakers usually cut it into two layers of servings, so count it as about double the chart number.
Worked example: a three-tier cake for 100 guests
Say you have 100 guests and you want a classic round, three-tier cake, served as wedding slices after dinner.
- Try 6, 8 and 10-inch tiers: 14 + 25 + 39 = 78 servings. That’s not enough.
- Try 8, 10 and 12-inch tiers: 25 + 39 + 56 = 120 servings. That covers 100 guests with some to spare.
- Many couples save the top tier for their first anniversary. If you do, take the 8-inch tier out: 95 servings from the 10 and 12-inch tiers, which is close, but a little short.
- One fix: keep the 6, 8 and 10-inch display cake (78 servings) and add a half sheet from the kitchen for 108 more. Now you have plenty, and a smaller display cake.
This is the kind of trade-off the wedding cake calculator makes quick: you pick tier sizes and see the total straight away.
How many servings do you actually need?
Not every guest eats cake. Some skip dessert, some leave early, and children may only want a bite. But it’s hard to know in advance, so most couples plan a serving for every guest. If you want to trim, these are reasonable times to plan fewer:
- there’s also a dessert table or other sweets;
- the wedding has lots of young children;
- many guests will leave before the cake is cut.
And times to plan more:
- the cake is the only dessert;
- you’re serving party slices because there’s no full meal;
- you want leftovers to send home with family.
Tips for planning your cake size
- Decide the slice size first. It changes the servings by about a third.
- Square gives more cake per inch. Useful if you want a smaller-looking cake that still feeds a crowd.
- Use kitchen sheet cakes. A small display cake plus sheet cakes behind the scenes is a common way to feed a big guest list.
- Tell your baker the serving size. Ask them to confirm how many servings they’re planning, and at what size.
- Mind the tier heights. These charts assume standard 4-inch tiers. Extra-tall or very short tiers change the numbers.
- Count the people who will really be there, not the number of invitations.
FAQ
How many people does a 3-tier wedding cake serve?
It depends on the sizes. A 6, 8 and 10-inch round cake serves about 78 people with wedding slices. An 8, 10 and 12-inch round serves about 120.
How many slices are in a 10-inch round cake?
About 39 wedding slices or 26 party slices, for a standard 4-inch-tall tier.
How many people does a half sheet cake feed?
A two-layer half sheet (12 × 18 inches) gives about 108 wedding slices or 72 party slices.
Is a wedding slice enough?
After a full dinner, usually yes. A wedding slice is 1 × 2 inches across the top and about 4 inches tall, which is a generous few bites.
Do square cakes serve more than round cakes?
Yes. A square tier holds more cake than a round tier of the same width, so it gives more servings.
Plan your cake
Use the wedding cake calculator to try different tier sizes and shapes, add sheet cakes, and see how many servings you’ll have for your guest count. If you have a price per slice from your baker, it’ll work out the cost too. For the price side, see our guide on how much a wedding cake costs.