Cake Serving Calculator (round & square tiers, party or wedding slices)

Understanding the cake serving calculator — concept and principle

This calculator tells you how many slices a tiered cake gives, tier by tier, and whether that covers your guest list. Bakers use it to choose pan sizes for weddings, birthdays and office parties, and hosts use it to check a bakery quote before ordering.

Slices from each tier: with the default inputs the result is 50 servings (= 50 guests, 0 spare).

How it is calculated

Total servings = servings of tier 1 + servings of tier 2 + servings of tier 3

Spare servings = total servings − guests

Each tier's count is read from the Wilton serving chart for the pan shape (round or square), the pan size (6 to 16 in) and the slice type.
A party slice is about 1½ × 2 in; a wedding slice about 1 × 2 in. Both run through the full height of the tier.
Tiers 3 to 6 in tall use the chart value. Tiers under 3 in tall give half, rounded down.
An empty tier ("No second tier") adds nothing.

The principle

A serving chart is really an area calculation. The top of a tier is cut into small rectangles, and the number of rectangles that fit depends on the pan's area. Area grows with the square of the diameter, so a 10 in round has more than twice the area of a 6 in round and gives about three times the wedding slices once you allow for the wasted curved edges. Square pans waste no edges, so they give more slices than a round pan of the same size. Wedding slices are narrower because cake at a wedding is served after a full meal.

Worked example

Default inputs: round pans, 10 in bottom tier, 6 in second tier, no third tier, wedding slices, tiers 3–6 in tall, 50 guests.

Round 10 in tier, wedding slices: 38 servings.
Round 6 in tier, wedding slices: 12 servings.
Total = 38 + 12 = 50 servings.
Spare = 50 − 50 = 0, so the result is "yes, enough servings", with nothing left over.

How to read the result

A spare count of zero means every guest gets exactly one slice if the cake is cut perfectly. Many bakers add about 10% for second helpings, serving staff and uneven cuts, so for 50 guests you would aim for 55 or more. A negative number tells you how many slices you are short; adding a tier or a kitchen sheet cake is the usual fix. If the top tier will be kept for an anniversary, set it to "No tier" so it is not counted.

Common mistakes

Counting party slices when the caterer will cut wedding slices, or the other way round.
Forgetting that a single-layer tier (under 3 in) gives half the servings.
Counting a top tier that will be saved and not served.
Measuring the cake board instead of the pan; the pan size is what counts.

Keep in mind: The chart assumes neat, even cuts with a sharp knife. Real cutting by guests or untrained staff gives fewer pieces, so keep a margin.

Frequently asked questions

How many people does a 2-tier 10 in and 6 in cake feed?

About 50 with wedding slices and about 40 with party slices, for tiers roughly 4 in tall.

Do square cakes really serve more?

Yes. A square pan has more area than a round pan of the same width and no curved edges, so it yields more slices.

Sources: Wilton Brands, "Cake Serving Chart" (party and wedding servings for 3–6 in tall tiers)

Checked 9 Nov 2026. Wilton Brands, “Cake Serving Chart” (Wilton blog, cake serving guide): party servings about 1½ × 2 in, wedding servings about 1 × 2 in, for 3–6 in tall tiers; tiers under 3 in yield half.

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