Precision calculator

Custom Shape Cake Buttercream Calculator

Use exact cake dimensions for a more specific estimate than quick round mode, with ingredient totals in grams and optional inches for size inputs.

This calculator uses a fixed custom-area ratio of 200g butter and 400g icing sugar per 1000cm² of frosting area.

Need to convert a recipe to a different tin first? Use the Cake Tin Size Converter before estimating buttercream.

Shape

Coverage

Diameter

Side

Length

Width

Layer height (typically 4cm)

Number of layers

Layers have filling Filled layers (between)

Breakdown