18 cm / 7 in round vs 25 cm / 10 in round
| 18 cm / 7 in round | 25 cm / 10 in round | |
|---|---|---|
| Size | 18 cm across | 25 cm across |
| Base area | 254.5 cm² | 490.9 cm² |
| Usual depth | 5 cm | 5 cm |
| Holds | 1.27 L | 2.45 L |
Can you swap them?
Scale the mixture, or accept a flatter cake. 25 cm / 10 in round has 92.9% more area, so a 18 cm / 7 in round mixture poured straight in sits 52% as deep. It still bakes, and it browns more at the edges for being shallower. Multiplying by 1.93 restores the depth the recipe was written for.
Scaling the recipe
| Recipe written for | Baked in | Multiply by | Or leave it and get |
|---|---|---|---|
| 18 cm / 7 in round | 25 cm / 10 in round | 1.93 | 52% of the depth |
| 25 cm / 10 in round | 18 cm / 7 in round | 0.52 | 193% of the depth |
Multiply every ingredient, including the eggs — round to the nearest half egg and adjust the liquid rather than rounding a whole one up.
Baking time
A mixture 52% as deep is done earlier, not cooler. Leave the temperature alone, start testing at about 60% of the stated time, and let the skewer decide. Why depth sets the time and diameter barely does →
Frequently asked questions
Can I use a 25 cm / 10 in round instead of a 18 cm / 7 in round?
Yes, with the mixture multiplied by 1.93. 25 cm / 10 in round has 490.9 cm² of base against 254.5 cm², so an unscaled 18 cm / 7 in round recipe sits 52% as deep and bakes faster.
What is the difference between a 18 cm / 7 in round and a 25 cm / 10 in round?
18 cm / 7 in round has a base area of 254.5 cm² and 25 cm / 10 in round has 490.9 cm² — 25 cm / 10 in round is 92.9% larger. At their usual depths they hold 1.27 L and 2.45 L.
Do I need to change the baking time between a 18 cm / 7 in round and a 25 cm / 10 in round?
Yes. Moving a 18 cm / 7 in round mixture into 25 cm / 10 in round makes it 52% as deep, so start checking at about 60% of the stated time. Depth drives baking time far more than tin diameter does.
18 cm / 7 in round in full · 25 cm / 10 in round in full · All tin comparisons · All baking tin sizes