Frosting Quantity Calculator
Cups of frosting needed = (cake top area + side area) × frosting depth, with overhead for piping.
Result
Frosting needed
7.24 cups
63.6 in² top, 113.1 in² sides.
- Top area63.6 in²
- Side area113.1 in²
- Filling layers1
- Frosting depth0.5"
- Volume (in³)104.26
- Cups7.24
- Recipe quantity2+ recipes
Step-by-step
- Top area = 63.6 in² (round).
- Side area = perimeter × height = 28.27 × 4 = 113.1 in².
- Volume = surface × depth + filling between layers = 104.26 in³.
- Cups = volume / 14.4 = 7.24.
How to use this calculator
- Pick cake shape and size.
- Enter total stacked height (2 layers × 2" = 4").
- Set number of filled layers.
- Pick coverage style.
About this calculator
A standard 9" round 2-layer cake with thick American buttercream needs about 4-5 cups of frosting (≈ 1 lb butter base). Crumb coat: 1/8" thick. Smooth final coat: 1/4". Piped decoration: add 1-2 cups extra. The standard "1 recipe of frosting" yields 3-3½ cups — enough for a 9" round 2-layer with medium coverage. Always make extra; no one regrets leftover frosting.
Frequently asked
American buttercream: 3-3.5 cups per pound of butter. Italian/French BC: 4-4.5 cups per pound. Cream cheese: 3 cups per 16 oz.
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