A French 20 cm cake pan is about 8 inches, 22 cm is about 9 inches and 24 cm is about 9½ inches (use a 9-inch pan, slightly fuller). To move a recipe between pans, scale it by the ratio of the pan areas: a 24 cm recipe in a 20 cm pan needs about 0.69 times the batter.
Pan size converter
| French round pan | Exact | Use in the US | Area |
|---|---|---|---|
| 16 cm | 6.3 in | 6-inch round | 201 cm² (31 in²) |
| 18 cm | 7.1 in | 7-inch round | 254 cm² (39 in²) |
| 20 cm | 7.9 in | 8-inch round | 314 cm² (49 in²) |
| 22 cm | 8.7 in | 9-inch round | 380 cm² (59 in²) |
| 24 cm | 9.4 in | 9-inch round | 452 cm² (70 in²) |
| 26 cm | 10.2 in | 10-inch round | 531 cm² (82 in²) |
| 28 cm | 11.0 in | 11-inch round | 616 cm² (95 in²) |
Area of a round pan = π × radius². Square and rectangular pans: length × width. Keep the batter depth the same and baking times stay close; deeper batter needs a lower oven and more time.
Questions people ask
What size is a 20 cm cake tin in inches?
7.9 inches; use an 8-inch pan.
Can I bake a 24 cm recipe in a 9-inch pan?
Yes. A 9-inch pan holds about 90% of a 24 cm recipe, so the cake will be a little taller; add a few minutes.
Cite this page: Mangez Moi, “Cake Pan Size Converter: cm to Inches and Recipe Scaling,” mangezmoi.com, updated October 6, 2026, https://mangezmoi.com/cake-pan-sizes/. Free to reuse under CC BY 4.0 with credit and a link.