Square metric area unit.
Square Kilometers to Hectares Converter — km2 to ha
Convert Square Kilometer (km2) to Hectare (ha) using the exact conversion factor (1 square kilometer = 100 hectare). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Square Kilometers to Hectares converter
Converter
Area Converter
Convert land, construction, mapping, survey, and scientific area units.
Context values
Some unit families need one extra value for a physically accurate result.
A hectare is 10,000 square meters.
Result = input x 1e+6 / 10000.
Area uses the square meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Square Kilometers to Hectares
Comparing Square Kilometer and Hectare is common in agriculture and real estate, where US land is typically measured in acres and most of the rest of the world uses hectares. Square Kilometer is typically associated with used worldwide for city, region, and country-scale area reporting., while Hectare is typically associated with used worldwide, especially in agriculture, forestry, and land statistics outside the US.
Formula
hectares = square kilometers × 100
This factor comes from each unit's defined relationship to the category's base unit: 1 square kilometer equals 1000000 base units, and 1 hectare equals 10000 base units, so dividing one by the other gives the direct square kilometer-to-hectare factor of 100.
Simple example
1 km2 × 100 = 100 ha
1 square kilometer = 100 hectares.
Real-world example
10 km2 × 100 = 1,000 ha
10 square kilometers = 1,000 hectares.
Conversion table
| Square Kilometer (km2) | Hectare (ha) |
|---|---|
| 1 km2 | 100 ha |
| 5 km2 | 500 ha |
| 10 km2 | 1,000 ha |
| 25 km2 | 2,500 ha |
| 50 km2 | 5,000 ha |
| 100 km2 | 10,000 ha |
Reverse conversion: Hectare to Square Kilometer
100 ha × 0.01 = 1 km2
100 hectares = 1 square kilometer.
square kilometers = hectares × 0.01
For a page dedicated to this direction, see Hectare to Square Kilometer.
Square Kilometer vs. Hectare
| Aspect | Square Kilometer | Hectare |
|---|---|---|
| Family | SI derived (metric prefix) unit | non-SI metric unit accepted for use with SI |
| Typical use | National and regional land-area statistics | Reporting farmland and crop area in international agricultural statistics |
| Where it's used | Used worldwide for city, region, and country-scale area reporting. | Used worldwide, especially in agriculture, forestry, and land statistics outside the US |
Understanding the Square Kilometer
Square Kilometer (km2) measures area. A square kilometer is one million square meters — the area of a 1 km × 1 km square. It is classified as a SI derived (metric prefix) unit.
Where it's used: Used worldwide for city, region, and country-scale area reporting.
Uses of the Square Kilometer today
- National and regional land-area statistics
- City and urban planning at large scale
- Geography and cartography
History of the Square Kilometer
Like other metric-prefixed area units, the square kilometer follows automatically from the kilometer once the meter was standardized in the 1790s French metric reform.
Historical origin. Square Kilometer was not the invention of a single named person; it developed through the process described above.
Understanding the Hectare
Hectare (ha) measures area. A hectare is exactly 10,000 square meters — the area of a 100 m × 100 m square. It is classified as a non-SI metric unit accepted for use with SI.
Where it's used: Used worldwide, especially in agriculture, forestry, and land statistics outside the US
Uses of the Hectare today
- Reporting farmland and crop area in international agricultural statistics
- Forestry and land-use planning
- Real estate and cadastral survey in metric countries
History of the Hectare
The hectare derives from the 'are,' a metric area unit (100 m²) introduced during the French Revolutionary metric reforms of the 1790s. 'Hecto-' is simply the SI prefix for 100, so a hectare is 100 ares.
Although not itself an SI unit, the hectare is officially accepted for use alongside SI units by the BIPM because of its practical importance in land measurement, and it remains the standard land-area unit in most of the world.
Historical origin. Hectare was not the invention of a single named person; it developed through the process described above.
Square Kilometer — sources
- BIPM SI Brochure — Coherent derived units — Basis for metric-prefixed area units.
Hectare — sources
- BIPM SI Brochure, 9th edition — Non-SI units accepted for use with SI — Lists the hectare as an accepted non-SI unit.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many hectares are in 1 square kilometer?
1 square kilometer equals 100 hectares, using the exact defined conversion factor rather than an estimate.
How do I convert square kilometer to hectare?
Multiply the square kilometer value by 100. The converter above does this instantly to whatever precision you set.
How do I convert hectare back to square kilometer?
Use the reverse factor: 1 hectare equals 0.01 square kilometers. You can also use the swap control in the converter above to flip the direction instantly.
What is a square kilometer?
Square Kilometer (km2) measures area. A square kilometer is one million square meters — the area of a 1 km × 1 km square. It is classified as a SI derived (metric prefix) unit.
What is a hectare?
Hectare (ha) measures area. A hectare is exactly 10,000 square meters — the area of a 100 m × 100 m square. It is classified as a non-SI metric unit accepted for use with SI.
Is the square kilometer to hectare conversion exact?
Yes. A hectare is exactly 10,000 square meters — the area of a 100 m × 100 m square. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the square kilometer still used today?
Used worldwide for city, region, and country-scale area reporting.