Choose your cake size and how many layers you're frosting to see how many cups of frosting to prepare.
The amount of frosting needed scales with a cake's surface area (top, sides, and between each layer), not just its diameter, so larger cakes and cakes with more layers need disproportionately more frosting. This calculator uses Wilton's standard per-size baseline (for a typical 2-layer cake) and scales it for your layer count.
Source: Based on Wilton's published cake-and-frosting amount guide, the standard reference used by home bakers and cake-decorating suppliers for estimating frosting quantities.
About 3 cups of frosting, enough to fill between the layers and fully cover the top and sides.
Roughly yes — each additional layer adds another filling layer plus more exposed side height, so this calculator scales the baseline amount proportionally to your layer count.
Yes — the amounts here cover a smooth crumb coat and final coat only. Add an extra 1/2 to 1 cup if you're piping borders, rosettes, or other decorative work.
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