28 cm / 11 in round vs 23 × 33 cm / 9 × 13 in
| 28 cm / 11 in round | 23 × 33 cm / 9 × 13 in | |
|---|---|---|
| Size | 28 cm across | 23 × 33 cm |
| Base area | 615.8 cm² | 754.8 cm² |
| Usual depth | 5 cm | 5 cm |
| Holds | 3.08 L | 3.77 L |
Can you swap them?
Scale the mixture, or accept a flatter cake. 23 × 33 cm / 9 × 13 in has 22.6% more area, so a 28 cm / 11 in round mixture poured straight in sits 82% as deep. It still bakes, and it browns more at the edges for being shallower. Multiplying by 1.23 restores the depth the recipe was written for.
Scaling the recipe
| Recipe written for | Baked in | Multiply by | Or leave it and get |
|---|---|---|---|
| 28 cm / 11 in round | 23 × 33 cm / 9 × 13 in | 1.23 | 82% of the depth |
| 23 × 33 cm / 9 × 13 in | 28 cm / 11 in round | 0.82 | 123% 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 82% as deep is done earlier, not cooler. Leave the temperature alone, start testing at about 82% 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 28 cm / 11 in round?
Yes, with the mixture multiplied by 1.23. 23 × 33 cm / 9 × 13 in has 754.8 cm² of base against 615.8 cm², so an unscaled 28 cm / 11 in round recipe sits 82% as deep and bakes faster.
What is the difference between a 28 cm / 11 in round and a 23 × 33 cm / 9 × 13 in?
28 cm / 11 in round has a base area of 615.8 cm² and 23 × 33 cm / 9 × 13 in has 754.8 cm² — 23 × 33 cm / 9 × 13 in is 22.6% larger. At their usual depths they hold 3.08 L and 3.77 L.
Do I need to change the baking time between a 28 cm / 11 in round and a 23 × 33 cm / 9 × 13 in?
Yes. Moving a 28 cm / 11 in round mixture into 23 × 33 cm / 9 × 13 in makes it 82% as deep, so start checking at about 82% of the stated time. Depth drives baking time far more than tin diameter does.
28 cm / 11 in round in full · 23 × 33 cm / 9 × 13 in in full · All tin comparisons · All baking tin sizes