Cake Serving Calculator — How Many Slices Does a Cake Yield?
How many guests will your cake feed? Enter the cake's shape and dimensions, choose a serving size (party, wedding, or generous), and get an instant slice count with the underlying area calculation.
Cake shape
in
Serving size
Slices based on the cake's cross-sectional area divided by serving area
- 1
Cake area (round)
π × (9 ÷ 2)² = π × 4.5² = 63.62 in² - 2
Servings
floor(63.62 ÷ 2) = 31floor() ensures you never promise more slices than the cake can yield.
How does this calculator work?
Servings = floor(cake area ÷ serving area). Round area = π(d/2)²; rectangular = l × w. Serving areas: party 2 in², wedding 1 in², generous 4 in². A 9-inch round yields ~31 party servings; a 9×13 sheet yields ~58 party servings.
Formula
How this is calculated
The number of servings a cake yields depends on its cross-sectional footprint divided by the area of a single serving. Serving area is the width × depth of each slice: a standard party slice is 2" wide × 1" deep into the cake (2 in²); a wedding slice is 1" × 1" = 1 in²; a generous dessert cut is 2" × 2" = 4 in². For a round cake the footprint is π × (d/2)²; for square and rectangular cakes it is simply l × w.
This approach closely matches the industry-standard Wilton serving chart: a 9-inch round gives floor(π × 4.5² / 2) = floor(31.8) = 31 party servings (Wilton says 32), and a 9×13 sheet gives floor(117 / 2) = 58 (Wilton says 54–58). The floor() function ensures you never promise more slices than the cake can yield.
Note that this calculator estimates servings from one horizontal layer. For tiered or multi-layer cakes, calculate each tier separately and sum the results. It also assumes consistently cut slices — first and last cuts are often irregular in practice, so add a few extra servings as a buffer for important events.
Frequently asked questions
A 9-inch round has an area of about 63.6 in². At party servings (2 in² each) that yields about 31 slices; at wedding servings (1 in² each) it gives 63; at generous servings (4 in²) it gives about 15.
A 9×13-inch pan has an area of 117 in². At party servings (2 in²) it yields 58 slices; at wedding servings (1 in²) it gives 117; at generous servings (4 in²), 29.
In the standard method, no — a serving is a full-height slice of the cake, whatever the cake height. Extra layers or height make each slice more filling but do not change the slice count. For tiered cakes, calculate each tier separately and add the results.
TG we-Calculate Editorial Team. (2026). Cake Serving Calculator — How Many Slices Does a Cake Yield? [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/cake-serving-calculator
TG we-Calculate Editorial Team. "Cake Serving Calculator — How Many Slices Does a Cake Yield?." TG we-Calculate. 2026. https://we-calculate.com/calculator/cake-serving-calculator.
TG we-Calculate Editorial Team, "Cake Serving Calculator — How Many Slices Does a Cake Yield?," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/cake-serving-calculator
@misc{wecalculate_cake_serving_calculator, title = {Cake Serving Calculator — How Many Slices Does a Cake Yield?}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/cake-serving-calculator}}, year = {2026}, note = {TG we-Calculate} }
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