18cm square tin to 20cm square tin
Multiply every ingredient by
×1.23
A 20cm square tin (8in) has 23% more area than a 18cm square tin (7in). Same depth of cake, more mixture.
| In the recipe | For your tin |
|---|---|
| 100g | 123g |
| 250g | 309g |
| 3 eggs | 3.7 eggs |
Paste your recipe into the scaler, already set to ×1.23. It rounds everything sensibly and tells you what to do with part of an egg.
The working
18cm square tin: 324cm² of base. 20cm square tin: 400cm². 400 ÷ 324 = 1.23. This assumes both tins are the same depth.