Formula
cm = inches × 2.54. 1 international inch = 25.4 mm exactly (Yard and Pound
Agreement; NIST SP 811). We do not print a long fake tail on a terminating value, and we mark
non-terminating results as rounded.
1 to 20 inches
| Inches | Centimetres | Status |
|---|---|---|
| 1 | 2.54 | Exact |
| 2 | 5.08 | Exact |
| 3 | 7.62 | Exact |
| 4 | 10.16 | Exact |
| 5 | 12.7 | Exact |
| 6 | 15.24 | Exact |
| 7 | 17.78 | Exact |
| 8 | 20.32 | Exact |
| 9 | 22.86 | Exact |
| 10 | 25.4 | Exact |
| 11 | 27.94 | Exact |
| 12 | 30.48 | Exact |
| 13 | 33.02 | Exact |
| 14 | 35.56 | Exact |
| 15 | 38.1 | Exact |
| 16 | 40.64 | Exact |
| 17 | 43.18 | Exact |
| 18 | 45.72 | Exact |
| 19 | 48.26 | Exact |
| 20 | 50.8 | Exact |
Related Spanish tools
FAQ
How many centimetres is one inch?
Exactly 2.54 cm. That is the international inch, fixed on 1 July 1959.
How do I convert inches to cm?
Multiply by 2.54. 10 × 2.54 = 25.4 cm. Fractions first become decimals: 1/2 × 2.54 = 1.27 cm.
Do you accept 5 1/2 and 5-1/2?
Yes. Common shop fractions (1/2, 1/4, 1/8, 1/16) and mixed numbers are parsed on the client.