Inches to centimetres
Type a value in either box. 1 in = 2.54 cm.
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How to convert
To convert inches to centimetres, multiply by 2.54.
cm = in × 2.54
For example: 8 in × 2.54 = 20.32 cm.
An inch is defined as exactly 2.54 centimetres (since 1959).
In your head: Multiply by 2.5: 4 in ≈ 10 cm (exactly 10.16 cm), about 2% low.
When you’ll need it
TV and monitor sizes, waist and inside-leg measurements and bike wheels are given in inches. A 55-inch TV is about 140 cm corner to corner.
Common values
| Inches (in) | Centimetres (cm) |
|---|---|
| 1 in | 2.54 cm |
| 2 in | 5.08 cm |
| 3 in | 7.62 cm |
| 4 in | 10.16 cm |
| 5 in | 12.7 cm |
| 6 in | 15.24 cm |
| 8 in | 20.32 cm |
| 10 in | 25.4 cm |
| 12 in | 30.48 cm |
| 24 in | 60.96 cm |
| 36 in | 91.44 cm |
| 60 in | 152.4 cm |
Questions
- How many centimetres are in an inch?
- 1 inch is 2.54 centimetres.
- What is the formula to convert inches to centimetres?
- cm = in × 2.54. An inch is defined as exactly 2.54 centimetres (since 1959).
- What is 8 inches in centimetres?
- 8 inches is 20.32 centimetres.