25cm round tin to 20cm round tin
Multiply every ingredient by
×0.64
A 20cm round tin (8in) has 36% less area than a 25cm round tin (10in). Same depth of cake, less mixture.
| In the recipe | For your tin |
|---|---|
| 100g | 64g |
| 250g | 160g |
| 3 eggs | 1.9 eggs |
Paste your recipe into the scaler, already set to ×0.64. It rounds everything sensibly and tells you what to do with part of an egg.
The working
25cm round tin: 490.87cm² of base. 20cm round tin: 314.16cm². 314.16 ÷ 490.87 = 0.64. This assumes both tins are the same depth.