Centimetres to Inches
Type a value in Centimetres and get the result in Inches, calculated exactly.
30 Centimetres ≈ 11.81102362 Inches
Precision
Exact factorRounded for display to about 10 significant digits.
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Formula
in = cm ÷ 2.54
To convert Centimetres to Inches, divide the value by 2.54.
Worked examples
- 1 cm ÷ 2.54 ≈ 0.3937007874 in
- 30 cm ÷ 2.54 ≈ 11.81102362 in
- 100 cm ÷ 2.54 ≈ 39.37007874 in
This factor is exact by definition.
Conversion table
| Centimetres (cm) | Inches (in) |
|---|---|
| 1 | ≈ 0.3937008 |
| 2 | ≈ 0.7874016 |
| 3 | ≈ 1.181102 |
| 4 | ≈ 1.574803 |
| 5 | ≈ 1.968504 |
| 6 | ≈ 2.362205 |
| 7 | ≈ 2.755906 |
| 8 | ≈ 3.149606 |
| 9 | ≈ 3.543307 |
| 10 | ≈ 3.937008 |
| 15 | ≈ 5.905512 |
| 20 | ≈ 7.874016 |
| 25 | ≈ 9.84252 |
| 30 | ≈ 11.81102 |
| 40 | ≈ 15.74803 |
| 50 | ≈ 19.68504 |
| 60 | ≈ 23.62205 |
| 70 | ≈ 27.55906 |
| 75 | ≈ 29.52756 |
| 80 | ≈ 31.49606 |
| 90 | ≈ 35.43307 |
| 100 | ≈ 39.37008 |
Values marked ≈ are rounded; the rest are exact.
Reverse table: Inches to Centimetres
| Inches (in) | Centimetres (cm) |
|---|---|
| 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 |
| 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 |
Unit definitions
- Centimetres cm
- One hundredth of a metre.
- Inches in
- Exactly 0.0254 metres, by the 1959 international agreement.
Questions people ask
Centimetres to Inches: what is the conversion factor?
One cm is ≈ 0.3937007874 in.
How do I convert Centimetres to Inches?
Use the formula above. For example, 30 cm = ≈ 11.81102362 in.
Is the conversion exact?
Yes. Both units have exact definitions, so the factor is exact; a result is only rounded when its decimals never end.
Factors checked 19 October 2026.