20cm round tin to 15cm round tin
Multiply every ingredient by
×0.56
A 15cm round tin (6in) has 44% less area than a 20cm round tin (8in). Same depth of cake, less mixture.
| In the recipe | For your tin |
|---|---|
| 100g | 56g |
| 250g | 141g |
| 3 eggs | 1.7 eggs |
Paste your recipe into the scaler, already set to ×0.56. It rounds everything sensibly and tells you what to do with part of an egg.
The working
20cm round tin: 314.16cm² of base. 15cm round tin: 176.71cm². 176.71 ÷ 314.16 = 0.56. This assumes both tins are the same depth.