The factor
One centimetre is 0.3937 inches. Dividing by 2.54 gives the same answer and is easier to remember: 23 ÷ 2.54 = 9.06 inches.
European tins in inches
- 15 cm ≈ 6 in · 18 cm ≈ 7 in · 20 cm ≈ 8 in
- 23 cm ≈ 9 in · 25 cm ≈ 10 in
- 23 × 33 cm ≈ 9 × 13 in (standard Swiss roll tin)
- 26 cm ≈ 10.2 in — a large springform
Fractional inches
US recipes use fractions: 8 1/2 inches rather than 8.5. The converter rounds to the nearest eighth so you can match the nearest tin rather than the exact millimetre.
Practical advice
Pan sizes are nominal and manufacturers vary by up to a centimetre. Match to the nearest standard size and adjust the bake time by 10% either way, checking early.
Frequently Asked Questions
Is 20 cm the same as 8 inches?
Very close — 20 cm is 7.87 inches, about 3 mm smaller.
How do I convert 23 cm to inches?
23 ÷ 2.54 = 9.06, so a 9-inch tin.
Do I need exact conversions for tins?
No — within 0.5 cm is fine; adjust time rather than hunting for an exact match.
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