23 × 33 cm / 9 × 13 in vs 20 × 30 cm traybake
| 23 × 33 cm / 9 × 13 in | 20 × 30 cm traybake | |
|---|---|---|
| Size | 23 × 33 cm | 20 × 30 cm |
| Base area | 754.8 cm² | 600 cm² |
| Usual depth | 5 cm | 5 cm |
| Holds | 3.77 L | 2.7 L |
Can you swap them?
Scale the mixture, or accept a flatter cake. 23 × 33 cm / 9 × 13 in has 25.8% more area, so a 20 × 30 cm traybake mixture poured straight in sits 79% as deep. It still bakes, and it browns more at the edges for being shallower. Multiplying by 1.26 restores the depth the recipe was written for.
Scaling the recipe
| Recipe written for | Baked in | Multiply by | Or leave it and get |
|---|---|---|---|
| 23 × 33 cm / 9 × 13 in | 20 × 30 cm traybake | 0.79 | 126% of the depth |
| 20 × 30 cm traybake | 23 × 33 cm / 9 × 13 in | 1.26 | 79% 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 79% as deep is done earlier, not cooler. Leave the temperature alone, start testing at about 79% 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 20 × 30 cm traybake instead of a 23 × 33 cm / 9 × 13 in?
Yes, with the mixture multiplied by 0.79. 20 × 30 cm traybake has 600 cm² of base against 754.8 cm², so an unscaled 23 × 33 cm / 9 × 13 in recipe sits 126% as deep and bakes faster.
What is the difference between a 23 × 33 cm / 9 × 13 in and a 20 × 30 cm traybake?
23 × 33 cm / 9 × 13 in has a base area of 754.8 cm² and 20 × 30 cm traybake has 600 cm² — 23 × 33 cm / 9 × 13 in is 25.8% larger. At their usual depths they hold 3.77 L and 2.7 L.
Do I need to change the baking time between a 23 × 33 cm / 9 × 13 in and a 20 × 30 cm traybake?
Yes. Moving a 20 × 30 cm traybake mixture into 23 × 33 cm / 9 × 13 in makes it 79% as deep, so start checking at about 79% of the stated time. Depth drives baking time far more than tin diameter does.
23 × 33 cm / 9 × 13 in in full · 20 × 30 cm traybake in full · All tin comparisons · All baking tin sizes