Wedding Cake Servings Calculator
Work out how many servings a tiered wedding cake yields — enter your tier sizes and shape and see if it covers your guest list.
How it works
round servings = round(π × (d/2)² ÷ 2) · square servings = round(d² ÷ 2) · total = sum of tiers (each ≈ a 1"×2"×4" slice)
Wedding-cake serving charts are just tier area divided by the footprint of a standard slice — a slim 1×2-inch finger, 4 inches tall. That is why a 12-inch round yields far more than double a 6-inch: area grows with the square of the diameter. Square tiers cut into a clean grid and yield roughly 25–30% more than a round of the same size. Many couples save the small top tier for their first anniversary, so plan the lower tiers to cover the whole guest list.
Worked example
A classic round 3-tier of 12", 9" and 6": about 57 + 32 + 14 = 103 servings using slim wedding slices — enough for 100 guests with a few to spare. The same sizes as squares would yield roughly 72 + 41 + 18 = 131.
Frequently asked questions
Why are "servings" so small?
The wedding-industry standard slice is a slender 1 × 2-inch piece, 4 inches tall — smaller than a birthday-cake slab. That is how a modest three-tier cake serves a hundred people. If you plan to cut generous slices, count on far fewer servings.
Do square cakes really serve more?
Yes — a square tier fills its footprint with no rounded edges and cuts into a tidy grid, yielding roughly a quarter to a third more servings than a round of the same size. This calculator accounts for the shape you pick.
Should I include the top tier in my count?
Only if you plan to serve it. Many couples freeze the top tier for their first anniversary; if so, size the lower tiers to cover all your guests on their own.
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This calculator is for educational purposes. Double-check important results before acting on them.