18 cm / 7 in round vs Loaf 21.5 × 11.5 cm / 8½ × 4½ in
| 18 cm / 7 in round | Loaf 21.5 × 11.5 cm / 8½ × 4½ in | |
|---|---|---|
| Size | 18 cm across | 22 × 12 cm |
| Base area | 254.5 cm² | 247.3 cm² |
| Usual depth | 5 cm | 7 cm |
| Holds | 1.27 L | 1.61 L |
Can you swap them?
Swap them freely. The areas are within 2.9% of each other, which is less than the variation between two tins of the same nominal size from different manufacturers. Use the recipe as written.
Scaling the recipe
| Recipe written for | Baked in | Multiply by | Or leave it and get |
|---|---|---|---|
| 18 cm / 7 in round | Loaf 21.5 × 11.5 cm / 8½ × 4½ in | 0.97 | 103% of the depth |
| Loaf 21.5 × 11.5 cm / 8½ × 4½ in | 18 cm / 7 in round | 1.03 | 97% 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
The depths work out the same here, so use the time as written. Why depth sets the time and diameter barely does →
Frequently asked questions
Can I use a Loaf 21.5 × 11.5 cm / 8½ × 4½ in instead of a 18 cm / 7 in round?
Yes, with the mixture multiplied by 0.97. Loaf 21.5 × 11.5 cm / 8½ × 4½ in has 247.3 cm² of base against 254.5 cm², so an unscaled 18 cm / 7 in round recipe sits 103% as deep and bakes faster.
What is the difference between a 18 cm / 7 in round and a Loaf 21.5 × 11.5 cm / 8½ × 4½ in?
18 cm / 7 in round has a base area of 254.5 cm² and Loaf 21.5 × 11.5 cm / 8½ × 4½ in has 247.3 cm² — 18 cm / 7 in round is 2.9% larger. At their usual depths they hold 1.27 L and 1.61 L.
Do I need to change the baking time between a 18 cm / 7 in round and a Loaf 21.5 × 11.5 cm / 8½ × 4½ in?
No. The two areas are within 2.9%, so the batter sits at effectively the same depth and bakes in the same time.
18 cm / 7 in round in full · Loaf 21.5 × 11.5 cm / 8½ × 4½ in in full · All tin comparisons · All baking tin sizes