Convert Square US Survey Mile to Square Kilometer
Convert square us survey miles to square kilometers instantly. 1 square us survey mile = 2.58999847 square kilometer — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Kilometer to Square US Survey Mile converter for the reverse conversion.
Units explained
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
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 to Square Kilometer conversion formula
The relationship between square us survey miles and square kilometers:
To convert square us survey miles to square kilometers, multiply the value in square us survey miles by 2.58999847. To reverse, multiply square kilometers by 0.3861006142.
How to use this converter
Type a value into the calculator. The result in square kilometers 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 Kilometer to Square US Survey Mile converter for the reverse direction.
Step-by-step: convert square us survey miles to square kilometers
- Write down the value in square us survey miles (smi²).
- Multiply that value by the factor 2.58999847.
- The product is the equivalent value in square kilometers (km²).
- To reverse, multiply the square kilometer value by 0.3861006142.
Worked examples
Example 1 — Convert 1 smi² to km²:
1 × 2.58999847 = 2.58999847 km²
Example 2 — Convert 100 smi² to km²:
100 × 2.58999847 = 258.999847 km²
Square US Survey Mile to Square Kilometer conversion table
Standard reference values for converting square us survey miles to square kilometers:
| Square US Survey Mile [smi²] | Square Kilometer [km²] |
|---|---|
| 0.01 | 0.0258999847 |
| 0.1 | 0.258999847 |
| 1 | 2.58999847 |
| 2 | 5.17999694 |
| 3 | 7.76999541 |
| 4 | 10.35999388 |
| 5 | 12.94999235 |
| 10 | 25.8999847 |
| 20 | 51.7999694 |
| 30 | 77.6999541 |
| 40 | 103.5999388 |
| 50 | 129.4999235 |
| 100 | 258.999847 |
| 500 | 1294.999235 |
| 1000 | 2589.99847 |
Frequently asked questions
How many square kilometers is 1 square us survey mile?
How do I convert square us survey miles to square kilometers?
How do I convert square kilometers back to square us survey miles?
How many square kilometers is 100 square us survey miles?
Popular area unit conversions
Convert Square US Survey Mile to other area units
Show all Square US Survey Mile conversions
Metric / SI (5 units)
Imperial / US Customary (3 units)
Sources & references
Conversion factor (1 smi² = 2.58999847 km²) 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.