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Cooking Length Conversions
Conversions of units of length are not very common in recipes, mainly being seen in cake making with the size of the tin that the mixture should fill being given in inches (in) or centimetres (cm). For instance a recipe may specify a 10" baking tin or a 20cm circular cake tin. Sometimes you will see a layer of an ingredient specified as 5mm or ¼in which will need to be converted. Below is a converter for inches to centimetres and centimetres to inches and further down the page is a converter for inches to millimetres and millimetres to inches.
Inches to Centimetres Converter
Type a value in either field to convert from inches to centimetres (in to cm) or centimetres to inches (cm to in) (results are accurate to two decimal places).
Common Inch to Centimetre Conversions Table
Most of the common inch to centimetre conversions are given in the table below (results are accurate to one decimal place).
| Inches | Centimetres |
| 1 | 2.5 |
| 2 | 5 |
| 3 | 7.5 |
| 4 | 10 |
| 5 | 12.5 |
| 6 | 15 |
| 7 | 17.5 |
| 8 | 20 |
| 9 | 22.5 |
| 10 | 25 |
| 11 | 27.5 |
| 12 | 30 |
| Inches | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Centimetres | 2.5 | 5 | 7.5 | 10 | 12.5 | 15 | 17.5 | 20 | 22.5 | 25 | 27.5 | 30 |
Inch to Centimetre Conversion Formula
The conversion formula for inches to centimetres (in to cm) is 1 inch = 2.54 centimetres.
Inches to Millimetres Converter
Type a value in either field to convert from inches to millimetres (in to mm) or millimetres to inches (mm to in) (results are accurate to one decimal place).
Inch to Millimetre Conversion Formula
The conversion formula for inches to millimetres (in to mm) is 1 inch = 25.4 millimetres.
Frequently Asked Questions
- How many centimetres in an inch?
- 1 inch equals 2.54 centimetres.
- How many millimetres in an inch?
- 1 inch equals 25.4 millimetres.
- What is a 9 inch tin in centimetres?
- A 9 inch tin is approximately 22.86cm (usually described as a 23cm tin).
- What is a 20cm tin in inches?
- A 20cm tin is approximately 7.87 inches (usually described as an 8 inch tin).
- Why do I need to convert tin sizes?
- Recipes often specify the size of cake tins or baking trays in inches or centimetres. Using the wrong size affects how deep the mixture sits and can change cooking times and results.