15cm round tin to 20cm round tin
Multiply every ingredient by
×1.78
A 20cm round tin (8in) has 78% more area than a 15cm round tin (6in). Same depth of cake, more mixture.
| In the recipe | For your tin |
|---|---|
| 100g | 178g |
| 250g | 444g |
| 3 eggs | 5.3 eggs |
Paste your recipe into the scaler, already set to ×1.78. It rounds everything sensibly and tells you what to do with part of an egg.
The working
15cm round tin: 176.71cm² of base. 20cm round tin: 314.16cm². 314.16 ÷ 176.71 = 1.78. This assumes both tins are the same depth.