The short answer
- 1 in = 2.54 cm
- 1 cm ≈ 0.3937008 in
Worked example12 in × 2.54 = 30.48 cm
UNIT CONVERSION
← Length converterInches to centimetres
To convert inches to centimetres, multiply the number of inches by 2.54.
What the units mean
Inch. The inch is exactly 2.54 centimetres, fixed by the international yard and pound agreement of 1959. There are 12 inches in a foot.
Centimetre. The centimetre is one hundredth of a metre, the SI base unit of length.
Inches to centimetres table
| Inches (in) | Centimetres (cm) |
|---|---|
| 0.5 | 1.27 |
| 1 | 2.54 |
| 2 | 5.08 |
| 3 | 7.62 |
| 4 | 10.16 |
| 5 | 12.7 |
| 6 | 15.24 |
| 7 | 17.78 |
| 8 | 20.32 |
| 9 | 22.86 |
| 10 | 25.4 |
| 12 | 30.48 |
| 15 | 38.1 |
| 20 | 50.8 |
| 25 | 63.5 |
| 30 | 76.2 |
| 40 | 101.6 |
| 50 | 127 |
| 60 | 152.4 |
| 70 | 177.8 |
| 75 | 190.5 |
| 80 | 203.2 |
| 90 | 228.6 |
| 100 | 254 |
| 150 | 381 |
| 200 | 508 |
| 250 | 635 |
| 500 | 1,270 |
| 1,000 | 2,540 |
Values are rounded to 7 significant figures.
Common questions
How do I convert inches to centimetres?
Multiply the number of inches by 2.54. For example, 12 in × 2.54 = 30.48 cm.
How many centimetres are in one inch?
One inch is exactly 2.54 centimetres.
Is this conversion exact?
Yes. Both units have exact legal definitions, so the factor is exact. Values on this page are rounded to 7 significant figures.