Convert Square Kilometer to Square US Survey Mile
Convert square kilometers to square us survey miles instantly. 1 square kilometer = 0.3861006142 square us survey mile — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square US Survey Mile 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 US Survey Mile
A square US survey mile is approximately 2,589,998 m², slightly larger than the international square mile.
Derived by squaring the US survey mile (5280 US survey feet).
Square US survey miles appear in older US Public Land Survey System records and state plane coordinate systems pre-dating 2023.
Defined in 1893; retired January 2023.
Square Kilometer to Square US Survey Mile conversion formula
The relationship between square kilometers and square us survey miles:
To convert square kilometers to square us survey miles, multiply the value in square kilometers by 0.3861006142. To reverse, multiply square us survey miles by 2.58999847.
How to use this converter
Type a value into the calculator. The result in square us survey miles 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 US Survey Mile to Square Kilometer converter for the reverse direction.
Step-by-step: convert square kilometers to square us survey miles
- Write down the value in square kilometers (km²).
- Multiply that value by the factor 0.3861006142.
- The product is the equivalent value in square us survey miles (smi²).
- To reverse, multiply the square us survey mile value by 2.58999847.
Worked examples
Example 1 — Convert 1 km² to smi²:
1 × 0.3861006142 = 0.3861006142 smi²
Example 2 — Convert 100 km² to smi²:
100 × 0.3861006142 = 38.6100614183 smi²
Square Kilometer to Square US Survey Mile conversion table
Standard reference values for converting square kilometers to square us survey miles:
| Square Kilometer [km²] | Square US Survey Mile [smi²] |
|---|---|
| 0.01 | 0.0038610061 |
| 0.1 | 0.0386100614 |
| 1 | 0.3861006142 |
| 2 | 0.7722012284 |
| 3 | 1.1583018425 |
| 4 | 1.5444024567 |
| 5 | 1.9305030709 |
| 10 | 3.8610061418 |
| 20 | 7.7220122837 |
| 30 | 11.5830184255 |
| 40 | 15.4440245673 |
| 50 | 19.3050307091 |
| 100 | 38.6100614183 |
| 500 | 193.0503070915 |
| 1000 | 386.100614183 |
Frequently asked questions
How many square us survey miles is 1 square kilometer?
How do I convert square kilometers to square us survey miles?
How do I convert square us survey miles back to square kilometers?
How many square us survey miles is 100 square kilometers?
Popular area unit conversions
Convert Square Kilometer to other area units
Show all Square Kilometer conversions
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 = 0.3861006142 smi²) 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.