20cm square tin to 23cm round tin
Multiply every ingredient by
×1.04
A 23cm round tin (9in) has 4% more area than a 20cm square tin (8in). Same depth of cake, more mixture.
| In the recipe | For your tin |
|---|---|
| 100g | 104g |
| 250g | 260g |
| 3 eggs | 3.1 eggs |
Paste your recipe into the scaler, already set to ×1.04. It rounds everything sensibly and tells you what to do with part of an egg.
The working
20cm square tin: 400cm² of base. 23cm round tin: 415.48cm². 415.48 ÷ 400 = 1.04. This assumes both tins are the same depth.