20cm round tin to 18cm square tin
Multiply every ingredient by
×1.03
A 18cm square tin (7in) has 3% more area than a 20cm round tin (8in). Same depth of cake, more mixture.
| In the recipe | For your tin |
|---|---|
| 100g | 103g |
| 250g | 258g |
| 3 eggs | 3.1 eggs |
Paste your recipe into the scaler, already set to ×1.03. It rounds everything sensibly and tells you what to do with part of an egg.
The working
20cm round tin: 314.16cm² of base. 18cm square tin: 324cm². 324 ÷ 314.16 = 1.03. This assumes both tins are the same depth.