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 square metre?
The square metre is the SI unit of area. It is widely used in real estate, construction, interior design, and land measurement across countries that use the metric system.
Real-world uses
Square metres are the global standard for floor space in real estate listings, construction blueprints, and land surveys outside the US. Solar panel output is rated per square metre, and rental prices in most countries are quoted per m².
History
The square metre is a derived SI unit that follows naturally from the metre. It became the standard area unit as the metric system spread globally. Real estate markets worldwide adopted it as metrication displaced local units like the tsubo (Japan) and pyeong (Korea).
Common mistakes
Confusing linear metres with square metres—a room that is 3 m × 4 m is 12 m², not 7 m. Also, forgetting that when scaling dimensions by a factor, area scales by the square of that factor.
When is this conversion used?
Converting square kilometre to square metre 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 = 1,000,000 square metre
1 square metre = 1 square metre
How to convert square kilometre to square metre
To convert square kilometre to square metre, multiply the value by 1,000,000.
To convert square metre back to square kilometre, multiply by 0.000001.
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 square metre
| square kilometre | square metre |
|---|---|
| 0.1 | 100,000 |
| 0.5 | 500,000 |
| 1 | 1,000,000 |
| 2 | 2,000,000 |
| 5 | 5,000,000 |
| 10 | 10,000,000 |
| 25 | 25,000,000 |
| 50 | 50,000,000 |
| 100 | 100,000,000 |
| 250 | 250,000,000 |
| 500 | 500,000,000 |
| 1,000 | 1.000000e+09 |
Common values
| square kilometre | square metre | |
|---|---|---|
| A4 paper | 6.200000e-08 square kilometre | 0.062 square metre |
| Parking space | 0.0000125 square kilometre | 12.5 square metre |
| Tennis court | 0.00026087 square kilometre | 260.87 square metre |
| Football field (soccer) | 0.00714 square kilometre | 7,140 square metre |
| Central Park, NYC | 3.41 square kilometre | 3,410,000 square metre |
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