Convert lengths between millimetres, centimetres, inches and feet for pan sizes and kitchen measurements.
Usage Tip
When swapping pan sizes, match the area, not just one dimension.
Converted Length
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In your chosen unitTHE MATH
length × (mm per unit) ÷ (mm per target unit)
1 in = 25.4 mm · 1 cm = 10 mm · 1 ft = 304.8 mm
Inch-to-centimetre is the most common kitchen conversion for cake tins and pans.
Converting a cake pan size?Pan area matters as much as the diameter.Cake Pan Converter →
Popular length conversions
1 in = 2.54 cm1 cm = 0.394 in9 in = 22.9 cm1 ft = 30.48 cm1 in = 25.4 mm
Inches to centimeters chart
| Inches | Centimeters | Millimeters |
|---|---|---|
| 1/4 in | 0.6 cm | 6 mm |
| 1/2 in | 1.3 cm | 13 mm |
| 1 in | 2.5 cm | 25 mm |
| 2 in | 5.1 cm | 51 mm |
| 6 in | 15.2 cm | 152 mm |
| 8 in | 20.3 cm | 203 mm |
| 9 in | 22.9 cm | 229 mm |
| 10 in | 25.4 cm | 254 mm |
| 12 in | 30.5 cm | 305 mm |
Common length questions
How many centimeters in an inch?
One inch is exactly 2.54 cm, or 25.4 mm. To go from inches to centimeters, multiply by 2.54; to reverse it, divide by 2.54.
What is 9 inches in centimeters?
9 inches is about 22.9 cm – a common cake-tin size. An 8-inch tin is 20.3 cm and a 10-inch tin is 25.4 cm.
Converting baking pan sizes
Recipes from different countries give pan sizes in inches or centimeters. Use this converter for the dimension, and the Cake Pan Converter above to scale batter between pan sizes, since capacity grows with area, not length.
Frequently asked questions
How many cm are in an inch?Exactly 2.54 cm (25.4 mm).
What is 9 inches in cm?About 22.9 cm.
How do I convert cm to inches?Divide centimeters by 2.54.
Why does pan capacity not scale with the inches?Capacity depends on area and depth, so a 10-inch pan holds much more than a 9-inch one despite being only an inch wider.
Popular cooking converters
Cake Pan ConverterCooking Measurement ConverterWeight ConverterGrams to Cups ConverterIngredient Weight ConverterRecipe Scaler
Note: Conversions use the exact factor 1 inch = 2.54 cm. For baking, remember that pan capacity scales with area and depth, not with the diameter alone.