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Millimeters to Centimeters (mm to cm)
Convert millimeters to centimeters: 1 mm = 0.1 cm. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 mm = 0.1 cm
centimeters = millimeters × 0.1 — reverse: millimeters = centimeters × 10
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 mm = 0.5 cm
- 12.5 mm = 1.25 cm
- 100 mm = 10 cm
Millimeters to centimeters conversion table
| Millimeters (mm) | Centimeters (cm) |
|---|---|
| 1 | 0.1 |
| 2 | 0.2 |
| 3 | 0.3 |
| 4 | 0.4 |
| 5 | 0.5 |
| 6 | 0.6 |
| 7 | 0.7 |
| 8 | 0.8 |
| 9 | 0.9 |
| 10 | 1 |
| 15 | 1.5 |
| 20 | 2 |
| 25 | 2.5 |
| 30 | 3 |
| 40 | 4 |
| 50 | 5 |
| 75 | 7.5 |
| 100 | 10 |
| 200 | 20 |
| 250 | 25 |
| 500 | 50 |
| 1000 | 100 |
FAQ
How many centimeters are in one millimeter?
1 mm = 0.1 cm. 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 millimeters to centimeters?
Multiply the value in millimeters by 0.1: centimeters = millimeters × 0.1. For example, 5 mm = 0.5 cm.
How do I convert centimeters back to millimeters?
Multiply by the inverse factor 10 (millimeters = centimeters × 10), or use the centimeters-to-millimeters page.
Related conversions
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=mm&to_unit=cm - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"mm","to_unit":"cm"} - Markdown: https://tttkmbb.com/conversion/mm-to-cm.md · JSON: https://tttkmbb.com/conversion/mm-to-cm.json (add
?value=for a result) · Units: /api/v1/units?quantity=length - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.