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Square meters to Square kilometers (m² to km²)
Convert square meters to square kilometers: 1 m² = 0.000001 km². Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 m² = 0.000001 km²
square kilometers = square meters × 0.000001 — reverse: square meters = square kilometers × 1000000
The factor is derived from the SI definitions of both units (base unit: m2) 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 m² = 0.000005 km²
- 12.5 m² = 0.0000125 km²
- 100 m² = 0.0001 km²
Square meters to square kilometers conversion table
| Square meters (m²) | Square kilometers (km²) |
|---|---|
| 1 | 0.000001 |
| 2 | 0.000002 |
| 3 | 0.000003 |
| 4 | 0.000004 |
| 5 | 0.000005 |
| 6 | 0.000006 |
| 7 | 0.000007 |
| 8 | 0.000008 |
| 9 | 0.000009 |
| 10 | 0.00001 |
| 15 | 0.000015 |
| 20 | 0.00002 |
| 25 | 0.000025 |
| 30 | 0.00003 |
| 40 | 0.00004 |
| 50 | 0.00005 |
| 75 | 0.000075 |
| 100 | 0.0001 |
| 200 | 0.0002 |
| 250 | 0.00025 |
| 500 | 0.0005 |
| 1000 | 0.001 |
FAQ
How many square kilometers are in one square meter?
1 m² = 0.000001 km². 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 square meters to square kilometers?
Multiply the value in square meters by 0.000001: square kilometers = square meters × 0.000001. For example, 5 m² = 0.000005 km².
How do I convert square kilometers back to square meters?
Multiply by the inverse factor 1000000 (square meters = square kilometers × 1000000), or use the square kilometers-to-square meters page.
Related conversions
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=m2&to_unit=km2 - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"m2","to_unit":"km2"} - Markdown: https://tttkmbb.com/conversion/square-meters-to-square-km.md · JSON: https://tttkmbb.com/conversion/square-meters-to-square-km.json (add
?value=for a result) · Units: /api/v1/units?quantity=area - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.