Convert Hectare to Square US Survey Mile
Convert hectares to square us survey miles instantly. 1 hectare = 0.0038610061 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 Hectare converter for the reverse conversion.
Units explained
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
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 to Square US Survey Mile conversion formula
The relationship between hectares and square us survey miles:
To convert hectares to square us survey miles, multiply the value in hectares by 0.0038610061. To reverse, multiply square us survey miles by 258.999847.
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 Hectare converter for the reverse direction.
Step-by-step: convert hectares to square us survey miles
- Write down the value in hectares (ha).
- Multiply that value by the factor 0.0038610061.
- The product is the equivalent value in square us survey miles (smi²).
- To reverse, multiply the square us survey mile value by 258.999847.
Worked examples
Example 1 — Convert 1 ha to smi²:
1 × 0.0038610061 = 0.0038610061 smi²
Example 2 — Convert 100 ha to smi²:
100 × 0.0038610061 = 0.3861006142 smi²
Real-world example — Road-sign distances across systems
A 100-hectare road sign converts cleanly into square us survey miles — exactly the conversion drivers planning trips abroad rely on when reading road signs in a different measurement system.
100 ha × 0.0038610061 = 0.3861006142 smi²
Real-world example — Endurance race distances
A 50-hectare cycling or running race converts to a recognizable distance in square us survey miles. Endurance athletes coming from a different measurement system use this conversion to compare training plans across regions.
50 ha × 0.0038610061 = 0.1930503071 smi²
Real-world example — Maritime exclusion zone
A 200-hectare exclusion zone (a common maritime boundary) converts to a different value in square us survey miles that's useful when describing the same zone in everyday land-distance units.
200 ha × 0.0038610061 = 0.7722012284 smi²
Hectare to Square US Survey Mile conversion table
Standard reference values for converting hectares to square us survey miles:
| Hectare [ha] | Square US Survey Mile [smi²] |
|---|---|
| 0.01 | 3.861006e-5 |
| 0.1 | 0.0003861006 |
| 1 | 0.0038610061 |
| 2 | 0.0077220123 |
| 3 | 0.0115830184 |
| 4 | 0.0154440246 |
| 5 | 0.0193050307 |
| 10 | 0.0386100614 |
| 20 | 0.0772201228 |
| 30 | 0.1158301843 |
| 40 | 0.1544402457 |
| 50 | 0.1930503071 |
| 100 | 0.3861006142 |
| 500 | 1.9305030709 |
| 1000 | 3.8610061418 |
Frequently asked questions
How many square us survey miles is 1 hectare?
How do I convert hectares to square us survey miles?
How do I convert square us survey miles back to hectares?
How many square us survey miles is 100 hectares?
Popular area unit conversions
Convert Hectare to other area units
Show all Hectare 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)
Historical / Pre-metric European (6 units)
Sources & references
Conversion factor (1 ha = 0.0038610061 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.