A hectare is 10,000 square meters.
Hectares to Square Kilometers Converter — ha to km2
Convert Hectare (ha) to Square Kilometer (km2) using the exact conversion factor (1 hectare = 0.01 square kilometer). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Hectares to Square Kilometers converter
Converter
Agriculture Converter
Convert acres, hectares, yield, seed, fertilizer, irrigation, and application-rate units.
Context values
Some unit families need one extra value for a physically accurate result.
Square metric area unit.
Result = input x 10000 / 1e+6.
Area units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Hectares to Square Kilometers
Hectare and Square Kilometer both measure a farming-related quantity — a land area or an application/yield rate per unit area — used to report crop yields, calculate how much fertilizer or seed a field needs, and plan irrigation. Hectare is typically associated with used worldwide, especially in agriculture, forestry, and land statistics outside the US, while Square Kilometer is typically associated with used worldwide for city, region, and country-scale area reporting..
Formula
square kilometers = hectares × 0.01
This factor comes from each unit's defined relationship to the category's base unit: 1 hectare equals 10000 base units, and 1 square kilometer equals 1000000 base units, so dividing one by the other gives the direct hectare-to-square kilometer factor of 0.01.
Simple example
1 ha × 0.01 = 0.01 km2
1 hectare = 0.01 square kilometers.
Real-world example
100 ha × 0.01 = 1 km2
100 hectares = 1 square kilometer.
Conversion table
| Hectare (ha) | Square Kilometer (km2) |
|---|---|
| 1 ha | 0.01 km2 |
| 5 ha | 0.05 km2 |
| 10 ha | 0.1 km2 |
| 50 ha | 0.5 km2 |
| 100 ha | 1 km2 |
| 500 ha | 5 km2 |
Reverse conversion: Square Kilometer to Hectare
0.01 km2 × 100 = 1 ha
0.01 square kilometers = 1 hectare.
hectares = square kilometers × 100
For a page dedicated to this direction, see Square Kilometer to Hectare.
Hectare vs. Square Kilometer
| Aspect | Hectare | Square Kilometer |
|---|---|---|
| Family | non-SI metric unit accepted for use with SI | SI derived (metric prefix) unit |
| Typical use | Reporting farmland and crop area in international agricultural statistics | National and regional land-area statistics |
| Where it's used | Used worldwide, especially in agriculture, forestry, and land statistics outside the US | Used worldwide for city, region, and country-scale area reporting. |
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.
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.
Hectare — sources
- BIPM SI Brochure, 9th edition — Non-SI units accepted for use with SI — Lists the hectare as an accepted non-SI unit.
Square Kilometer — sources
- BIPM SI Brochure — Coherent derived units — Basis for metric-prefixed area units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many square kilometers are in 1 hectare?
1 hectare equals 0.01 square kilometers, using the exact defined conversion factor rather than an estimate.
How do I convert hectare to square kilometer?
Multiply the hectare value by 0.01. The converter above does this instantly to whatever precision you set.
How do I convert square kilometer back to hectare?
Use the reverse factor: 1 square kilometer equals 100 hectares. You can also use the swap control in the converter above to flip the direction instantly.
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.
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.
Is the hectare to square kilometer 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 hectare still used today?
Used worldwide, especially in agriculture, forestry, and land statistics outside the US
What's the difference between a yield rate and an application rate?
A yield rate describes how much of a crop is harvested per unit of land area (for example, tonnes per hectare). An application rate describes how much of an input like fertilizer or seed is applied per unit of land area. Both are commonly expressed using the same kind of mass-per-area units.