18cm square tin to 15cm square tin
Multiply every ingredient by
×0.69
A 15cm square tin (6in) has 31% less area than a 18cm square tin (7in). Same depth of cake, less mixture.
| In the recipe | For your tin |
|---|---|
| 100g | 69g |
| 250g | 174g |
| 3 eggs | 2.1 eggs |
Paste your recipe into the scaler, already set to ×0.69. It rounds everything sensibly and tells you what to do with part of an egg.
The working
18cm square tin: 324cm² of base. 15cm square tin: 225cm². 225 ÷ 324 = 0.69. This assumes both tins are the same depth.