30 cm / 12 in round tin
707 cm² · 3.5 litres
30 cm across · 109.6 in² · 50 mm deep · round
About this tin
A catering-scale round, and about the largest that fits a standard 60 cm oven with room for air to circulate.
The numbers
| Diameter | 30 cm · 11.8 in |
| Depth | 50 mm · 2.0 in |
| Base area | 707 cm² · 109.6 in² |
| Volume to the rim | 3.5 litres |
| Usable batter | about 2.1 litres — filled to roughly two thirds |
What can replace a 30 cm / 12 in round
A recipe is written for an area, because area sets the depth and depth sets the baking time. Anything within about 10% needs no adjustment. Past that, change the time first and only then the temperature.
| Tin | Area | vs this one | Effect |
|---|---|---|---|
| 23 × 33 cm / 9 × 13 in | 755 cm² | +7% | Interchangeable — no change needed |
| 28 cm / 11 in round | 616 cm² | -13% | Batter 1.15× as deep — allow 6–13 minutes longer |
| 20 × 30 cm traybake | 600 cm² | -15% | Batter 1.18× as deep — allow 8–15 minutes longer |
| Springform 26 cm | 531 cm² | -25% | Batter 1.33× as deep — allow 12–25 minutes longer |
| Swiss roll 25 × 38 cm | 950 cm² | +34% | Batter 0.74× as deep — check 17–34 minutes early |
Frequently asked questions
What is the area of a 30 cm / 12 in round tin?
707 cm² (109.6 in²), holding roughly 3.5 litres filled to 50 mm.
Can I use a different tin instead of a 30 cm / 12 in round?
The closest here is 23 × 33 cm / 9 × 13 in at 755 cm² — 7% more area, so the mixture sits shallower and bakes faster. As a rule, anything within about 10% needs no change; beyond that, adjust the time before the temperature.
How much does a 30 cm / 12 in round tin hold?
About 3.5 litres to a depth of 50 mm. Cake batter is normally filled to between half and two thirds, so 2.1 litres of mixture is a working figure.
Why does tin size change the baking time?
Because a recipe is written for a depth, not a name. Heat reaches the centre of a shallow cake sooner, so the same mixture in a wider tin is done earlier and browns more at the edges. The area ratio tells you how much shallower: swapping a 30 cm / 12 in round for a 23 × 33 cm / 9 × 13 in changes the depth by a factor of 0.94.
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