18 cm / 7 in square vs Springform 20 cm / 8 in
| 18 cm / 7 in square | Springform 20 cm / 8 in | |
|---|---|---|
| Size | 18 × 18 cm | 20 cm across |
| Base area | 324 cm² | 314.2 cm² |
| Usual depth | 5 cm | 7 cm |
| Holds | 1.62 L | 2.04 L |
Can you swap them?
Swap them freely. The areas are within 3.1% 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.
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 |
|---|---|---|---|
| 18 cm / 7 in square | Springform 20 cm / 8 in | 0.97 | 103% of the depth |
| Springform 20 cm / 8 in | 18 cm / 7 in square | 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 Springform 20 cm / 8 in instead of a 18 cm / 7 in square?
Yes, with the mixture multiplied by 0.97. Springform 20 cm / 8 in has 314.2 cm² of base against 324 cm², so an unscaled 18 cm / 7 in square recipe sits 103% as deep and bakes faster.
What is the difference between a 18 cm / 7 in square and a Springform 20 cm / 8 in?
18 cm / 7 in square has a base area of 324 cm² and Springform 20 cm / 8 in has 314.2 cm² — 18 cm / 7 in square is 3.1% larger. At their usual depths they hold 1.62 L and 2.04 L.
Do I need to change the baking time between a 18 cm / 7 in square and a Springform 20 cm / 8 in?
No. The two areas are within 3.1%, so the batter sits at effectively the same depth and bakes in the same time.
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18 cm / 7 in square in full · Springform 20 cm / 8 in in full · All tin comparisons · All baking tin sizes