Convert Square US Survey Mile to Hectare
Convert square us survey miles to hectares instantly. 1 square us survey mile = 258.999847 hectare — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Hectare 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.
Hectare
A hectare is a metric unit of area equal to 10,000 square meters, or one square hectometer. It is the most widely used metric unit for land measurement worldwide.
Defined as 100 ares, equal to one square hectometer. The name was introduced in 1795 in France as part of the metric system.
Hectares are the standard unit for agricultural land measurement worldwide except in the US (which uses acres). 1 hectare equals 2.47105 acres. In India, hectares are used in modern agricultural census and land records alongside traditional regional units.
Adopted in France in 1795; standardized internationally through the SI system.
Square US Survey Mile to Hectare conversion formula
The relationship between square us survey miles and hectares:
To convert square us survey miles to hectares, multiply the value in square us survey miles by 258.999847. To reverse, multiply hectares by 0.0038610061.
How to use this converter
Type a value into the calculator. The result in hectares updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Hectare to Square US Survey Mile converter for the reverse direction.
Step-by-step: convert square us survey miles to hectares
- Write down the value in square us survey miles (smi²).
- Multiply that value by the factor 258.999847.
- The product is the equivalent value in hectares (ha).
- To reverse, multiply the hectare value by 0.0038610061.
Worked examples
Example 1 — Convert 1 smi² to ha:
1 × 258.999847 = 258.999847 ha
Example 2 — Convert 100 smi² to ha:
100 × 258.999847 = 25899.9847 ha
Square US Survey Mile to Hectare conversion table
Standard reference values for converting square us survey miles to hectares:
| Square US Survey Mile [smi²] | Hectare [ha] |
|---|---|
| 0.01 | 2.58999847 |
| 0.1 | 25.8999847 |
| 1 | 258.999847 |
| 2 | 517.999694 |
| 3 | 776.999541 |
| 4 | 1035.999388 |
| 5 | 1294.999235 |
| 10 | 2589.99847 |
| 20 | 5179.99694 |
| 30 | 7769.99541 |
| 40 | 10359.99388 |
| 50 | 12949.99235 |
| 100 | 25899.9847 |
| 500 | 129499.9235 |
| 1000 | 258999.847 |
Frequently asked questions
How many hectares is 1 square us survey mile?
How do I convert square us survey miles to hectares?
How do I convert hectares back to square us survey miles?
How many hectares 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 = 258.999847 ha) 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.