What is square kilometre?
A square kilometre is a metric unit of area equal to one million square metres. It is used for measuring large geographic areas such as countries, forests, lakes, and urban zones.
Real-world uses
Square kilometres are used for country areas, city boundaries, national park sizes, and deforestation tracking. Geographic and environmental data, including satellite imagery resolution, reference areas in km². Singapore is about 733 km², for scale.
History
The square kilometre became the standard large-area unit with global metrication, replacing traditional units like the square league. It is the preferred unit for geographic and political area comparisons in international statistics and the United Nations system.
Common mistakes
Thinking 1 km² = 1,000 m². It is actually 1,000,000 m² (1 km × 1 km). Also, confusing square kilometres with kilometres squared in conversation, though mathematically they mean the same thing.
What is hectare?
A hectare is a metric unit of area equal to 10,000 square metres. It is the standard unit for measuring agricultural land, forest areas, and large parcels of real estate in metric countries.
Real-world uses
Hectares are the standard unit for agricultural land measurement, forestry management, and urban planning worldwide. Wine regions report vineyard sizes in hectares, and environmental reports quantify habitat loss in hectares. One hectare is roughly the size of two American football fields.
History
The hectare was introduced during the French Revolution as part of the metric system, originally called a "hecto-are" (100 ares). Though not an official SI unit, it is accepted for use with SI and remains the predominant land area unit in global agriculture.
Common mistakes
Confusing hectares with acres—1 hectare is about 2.47 acres, not 1-to-1. Also, some people confuse "hectare" with "hectometre," but a hectare is 10,000 m² (100 m × 100 m), a unit of area, not length.
When is this conversion used?
Converting square kilometre to hectare is useful in the area domain when comparing values across different measurement standards or applying formulas that require a specific unit.
Worked examples
1 square kilometre = 100 hectare
1 hectare = 10,000 square metre
How to convert square kilometre to hectare
To convert square kilometre to hectare, multiply the value by 100.
To convert hectare back to square kilometre, multiply by 0.01.
Measurement standards
The square metre is the SI derived unit of area. The hectare (10,000 m²) is accepted for use with the SI by the BIPM, particularly for land measurement, though it is not an SI unit itself.
Did you know?
Vatican City, the world's smallest independent state, covers just 0.44 km² (about 109 acres) — smaller than many golf courses. By contrast, Russia spans over 17.1 million km², nearly 39 million times larger.
Quick reference: square kilometre to hectare
| square kilometre | hectare |
|---|---|
| 0.1 | 10 |
| 0.5 | 50 |
| 1 | 100 |
| 2 | 200 |
| 5 | 500 |
| 10 | 1,000 |
| 25 | 2,500 |
| 50 | 5,000 |
| 100 | 10,000 |
| 250 | 25,000 |
| 500 | 50,000 |
| 1,000 | 100,000 |
Common values
| square kilometre | hectare | |
|---|---|---|
| A4 paper | 6.200000e-08 square kilometre | 0.0000062 hectare |
| Parking space | 0.0000125 square kilometre | 0.00125 hectare |
| Tennis court | 0.00026087 square kilometre | 0.026087 hectare |
| Football field (soccer) | 0.00714 square kilometre | 0.714 hectare |
| Central Park, NYC | 3.41 square kilometre | 341 hectare |
Available Area units
More square kilometre conversions
- Convert square kilometre to square metre
- Convert square kilometre to square foot
- Convert square kilometre to square mile
- Convert square kilometre to acre
- Convert square kilometre to hectare
- Convert square kilometre to square centimetre
- Convert square kilometre to square inch
- Convert square kilometre to square yard
- Convert square kilometre to are