18cm round tin to 15cm round tin
Multiply every ingredient by
×0.69
A 15cm round tin (6in) has 31% less area than a 18cm round 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 round tin: 254.47cm² of base. 15cm round tin: 176.71cm². 176.71 ÷ 254.47 = 0.69. This assumes both tins are the same depth.