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Hectares to Square kilometers (ha to km²)
Convert hectares to square kilometers: 1 ha = 0.01 km². Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 ha = 0.01 km²
square kilometers = hectares × 0.01 — reverse: hectares = square kilometers × 100
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 ha = 0.05 km²
- 12.5 ha = 0.125 km²
- 100 ha = 1 km²
Hectares to square kilometers conversion table
| Hectares (ha) | Square kilometers (km²) |
|---|---|
| 1 | 0.01 |
| 2 | 0.02 |
| 3 | 0.03 |
| 4 | 0.04 |
| 5 | 0.05 |
| 6 | 0.06 |
| 7 | 0.07 |
| 8 | 0.08 |
| 9 | 0.09 |
| 10 | 0.1 |
| 15 | 0.15 |
| 20 | 0.2 |
| 25 | 0.25 |
| 30 | 0.3 |
| 40 | 0.4 |
| 50 | 0.5 |
| 75 | 0.75 |
| 100 | 1 |
| 200 | 2 |
| 250 | 2.5 |
| 500 | 5 |
| 1000 | 10 |
FAQ
How many square kilometers are in one hectare?
1 ha = 0.01 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 hectares to square kilometers?
Multiply the value in hectares by 0.01: square kilometers = hectares × 0.01. For example, 5 ha = 0.05 km².
How do I convert square kilometers back to hectares?
Multiply by the inverse factor 100 (hectares = square kilometers × 100), or use the square kilometers-to-hectares page.
Related conversions
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=ha&to_unit=km2 - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"ha","to_unit":"km2"} - Markdown: https://tttkmbb.com/conversion/hectares-to-square-km.md · JSON: https://tttkmbb.com/conversion/hectares-to-square-km.json (add
?value=for a result) · Units: /api/v1/units?quantity=area - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.