23cm round tin to 18cm round tin
Multiply every ingredient by
×0.61
A 18cm round tin (7in) has 39% less area than a 23cm round tin (9in). Same depth of cake, less mixture.
| In the recipe | For your tin |
|---|---|
| 100g | 61g |
| 250g | 153g |
| 3 eggs | 1.8 eggs |
Paste your recipe into the scaler, already set to ×0.61. It rounds everything sensibly and tells you what to do with part of an egg.
The working
23cm round tin: 415.48cm² of base. 18cm round tin: 254.47cm². 254.47 ÷ 415.48 = 0.61. This assumes both tins are the same depth.