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Centimeters to Inches (cm to in)
Convert centimeters to inches: 1 cm = 0.393701 in. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 cm = 0.393701 in
inches = centimeters × 0.3937007874 — reverse: centimeters = inches × 2.54
The factor is derived from the SI definitions of both units (base unit: m) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.
Worked examples
- 5 cm = 1.9685 in
- 12.5 cm = 4.92126 in
- 100 cm = 39.3701 in
Centimeters to inches conversion table
| Centimeters (cm) | Inches (in) |
|---|---|
| 1 | 0.393701 |
| 2 | 0.787402 |
| 3 | 1.1811 |
| 4 | 1.5748 |
| 5 | 1.9685 |
| 6 | 2.3622 |
| 7 | 2.75591 |
| 8 | 3.14961 |
| 9 | 3.54331 |
| 10 | 3.93701 |
| 15 | 5.90551 |
| 20 | 7.87402 |
| 25 | 9.84252 |
| 30 | 11.811 |
| 40 | 15.748 |
| 50 | 19.685 |
| 75 | 29.5276 |
| 100 | 39.3701 |
| 200 | 78.7402 |
| 250 | 98.4252 |
| 500 | 196.85 |
| 1000 | 393.701 |
FAQ
How many inches are in one centimeter?
1 cm = 0.393701 in. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.
What is the formula to convert centimeters to inches?
Multiply the value in centimeters by 0.3937007874: inches = centimeters × 0.3937007874. For example, 5 cm = 1.9685 in.
How do I convert inches back to centimeters?
Multiply by the inverse factor 2.54 (centimeters = inches × 2.54), or use the inches-to-centimeters page.
Related conversions
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=cm&to_unit=in - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"cm","to_unit":"in"} - Markdown: https://tttkmbb.com/conversion/cm-to-inches.md · JSON: https://tttkmbb.com/conversion/cm-to-inches.json (add
?value=for a result) · Units: /api/v1/units?quantity=length - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.