Convert Square Kilometer to Square Decimeter
Convert square kilometers to square decimeters instantly. 1 square kilometer = 1e+8 square decimeter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Decimeter 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 Decimeter
A square decimeter is a metric unit of area equal to 0.01 m². It is rarely used in everyday measurement but exists for SI completeness and appears in some scientific contexts.
Derived by squaring the decimeter (1/10 of a meter). The deci- prefix comes from the Latin 'decimus' (tenth).
Square decimeters appear in some scientific contexts and in regions where the decimeter itself is used. Most everyday applications would use cm² or m² instead.
Decimeter has been part of the metric system since 1795.
Square Kilometer to Square Decimeter conversion formula
The relationship between square kilometers and square decimeters:
To convert square kilometers to square decimeters, multiply the value in square kilometers by 1e+8. To reverse, multiply square decimeters by 1e-8.
How to use this converter
Type a value into the calculator. The result in square decimeters 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 Decimeter to Square Kilometer converter for the reverse direction.
Step-by-step: convert square kilometers to square decimeters
- Write down the value in square kilometers (km²).
- Multiply that value by the factor 1e+8.
- The product is the equivalent value in square decimeters (dm²).
- To reverse, multiply the square decimeter value by 1e-8.
Worked examples
Example 1 — Convert 1 km² to dm²:
1 × 1e+8 = 1e+8 dm²
Example 2 — Convert 100 km² to dm²:
100 × 1e+8 = 1e+10 dm²
Square Kilometer to Square Decimeter conversion table
Standard reference values for converting square kilometers to square decimeters:
| Square Kilometer [km²] | Square Decimeter [dm²] |
|---|---|
| 0.01 | 1000000 |
| 0.1 | 1e+7 |
| 1 | 1e+8 |
| 2 | 2e+8 |
| 3 | 3e+8 |
| 4 | 4e+8 |
| 5 | 5e+8 |
| 10 | 1e+9 |
| 20 | 2e+9 |
| 30 | 3e+9 |
| 40 | 4e+9 |
| 50 | 5e+9 |
| 100 | 1e+10 |
| 500 | 5e+10 |
| 1000 | 1e+11 |
Frequently asked questions
How many square decimeters is 1 square kilometer?
How do I convert square kilometers to square decimeters?
How do I convert square decimeters back to square kilometers?
How many square decimeters 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 = 1e+8 dm²) 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 Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.