30 cm / 12 in round vs 23 × 33 cm / 9 × 13 in
| 30 cm / 12 in round | 23 × 33 cm / 9 × 13 in | |
|---|---|---|
| Size | 30 cm across | 23 × 33 cm |
| Base area | 706.9 cm² | 754.8 cm² |
| Usual depth | 5 cm | 5 cm |
| Holds | 3.53 L | 3.77 L |
Can you swap them?
Swap without changing the recipe, but watch the oven. 23 × 33 cm / 9 × 13 in has 6.8% more area, so a mixture written for 30 cm / 12 in round sits about 94% as deep in it and browns sooner.
Nothing standard sits between these two, so this is the smallest change available in this shape.
Scaling the recipe
| Recipe written for | Baked in | Multiply by | Or leave it and get |
|---|---|---|---|
| 30 cm / 12 in round | 23 × 33 cm / 9 × 13 in | 1.07 | 94% of the depth |
| 23 × 33 cm / 9 × 13 in | 30 cm / 12 in round | 0.94 | 107% 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 94% as deep is done earlier, not cooler. Leave the temperature alone, start testing at about 94% 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 23 × 33 cm / 9 × 13 in instead of a 30 cm / 12 in round?
Yes, with the mixture multiplied by 1.07. 23 × 33 cm / 9 × 13 in has 754.8 cm² of base against 706.9 cm², so an unscaled 30 cm / 12 in round recipe sits 94% as deep and bakes faster.
What is the difference between a 30 cm / 12 in round and a 23 × 33 cm / 9 × 13 in?
30 cm / 12 in round has a base area of 706.9 cm² and 23 × 33 cm / 9 × 13 in has 754.8 cm² — 23 × 33 cm / 9 × 13 in is 6.8% larger. At their usual depths they hold 3.53 L and 3.77 L.
Do I need to change the baking time between a 30 cm / 12 in round and a 23 × 33 cm / 9 × 13 in?
Yes. Moving a 30 cm / 12 in round mixture into 23 × 33 cm / 9 × 13 in makes it 94% as deep, so start checking at about 94% of the stated time. Depth drives baking time far more than tin diameter does.
Related comparisons
- 28 cm / 11 in round vs 30 cm / 12 in round
- 28 cm / 11 in round vs 23 × 33 cm / 9 × 13 in
- 30 cm / 12 in round vs 20 × 30 cm traybake
- 23 × 33 cm / 9 × 13 in vs 20 × 30 cm traybake
30 cm / 12 in round in full · 23 × 33 cm / 9 × 13 in in full · All tin comparisons · All baking tin sizes