Convert Square Kilometer to Square Meter
Convert square kilometers to square meters instantly. 1 square kilometer = 1000000 square meter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Meter to Square Kilometer converter for the reverse conversion.
Units explained
Square Kilometer
A square kilometer is a metric unit of area equal to 1,000,000 m² (one million square meters), or 100 hectares. It is used for measuring large land areas, regional geography, and country-scale statistics.
Derived by squaring the kilometer (1000 m). The kilo- prefix comes from the Greek 'chilioi' (thousand).
Square kilometers express the area of cities, districts, lakes, forests, and entire countries. India's total area is approximately 3,287,263 km². 1 km² equals 100 hectares or about 247.105 acres.
Kilometer has been part of the metric system since 1795.
Square Meter
A square meter is the SI base unit of area, defined as the area of a square with sides of one meter. It is the universal scientific unit for area.
Defined by squaring the meter, which was redefined in 2019 in terms of the speed of light. The meter itself was originally proposed by the French Academy of Sciences in 1791 as 1/10,000,000 of the distance from the equator to the North Pole.
Square meters are the universal SI unit for area, used in real estate (most countries outside the US/UK), construction, physics, engineering, materials science, biology, and nearly all scientific contexts worldwide.
Meter adopted as SI base unit in 1960; current exact definition via speed of light dates to 2019.
Square Kilometer to Square Meter conversion formula
The relationship between square kilometers and square meters:
To convert square kilometers to square meters, multiply the value in square kilometers by 1000000. To reverse, multiply square meters by 1e-6.
How to use this converter
Type a value into the calculator. The result in square meters updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Square Meter to Square Kilometer converter for the reverse direction.
Step-by-step: convert square kilometers to square meters
- Write down the value in square kilometers (km²).
- Multiply that value by the factor 1000000.
- The product is the equivalent value in square meters (m²).
- To reverse, multiply the square meter value by 1e-6.
Worked examples
Example 1 — Convert 1 km² to m²:
1 × 1000000 = 1000000 m²
Example 2 — Convert 100 km² to m²:
100 × 1000000 = 1e+8 m²
Square Kilometer to Square Meter conversion table
Standard reference values for converting square kilometers to square meters:
| Square Kilometer [km²] | Square Meter [m²] |
|---|---|
| 0.01 | 10000 |
| 0.1 | 100000 |
| 1 | 1000000 |
| 2 | 2000000 |
| 3 | 3000000 |
| 4 | 4000000 |
| 5 | 5000000 |
| 10 | 1e+7 |
| 20 | 2e+7 |
| 30 | 3e+7 |
| 40 | 4e+7 |
| 50 | 5e+7 |
| 100 | 1e+8 |
| 500 | 5e+8 |
| 1000 | 1e+9 |
Frequently asked questions
How many square meters is 1 square kilometer?
How do I convert square kilometers to square meters?
How do I convert square meters back to square kilometers?
How many square meters is 100 square kilometers?
Popular area unit conversions
Convert Square Kilometer to other area units
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Metric / SI (15 units)
Imperial / US Customary (15 units)
US Survey (5 units)
Indian Subcontinent (16 units)
Other Regional (10 units)
Scientific / Physics (5 units)
Sources & references
Conversion factor (1 km² = 1000000 m²) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.