Square Mile (US Survey) to Square Hectometer Converter
Unit Converter
Instant · Precise · Universal
23 units available
6 categories total
How to Convert Square Mile (US Survey) to Square Hectometer
To convert US survey mi² to km²: multiply by 2.590. To international mi²: multiply by ~1.000004.
1 mi² (US) ≈ 2,589,998.47 m². Differs from international mi² (2,589,988.11 m²) by about 10.36 m².
For example, 1 Square Mile (US Survey) (mi² (US)) = 258.999847 Square Hectometer (hm²).
Square Mile (US Survey) to Square Hectometer — Common Values
| Square Mile (US Survey) (mi² (US)) | Square Hectometer (hm²) |
|---|---|
| 0.1 | 25.8999847 |
| 0.5 | 129.4999235 |
| 1 | 258.999847 |
| 2 | 517.9996941 |
| 5 | 1294.999235 |
| 10 | 2589.99847 |
| 25 | 6474.996176 |
| 50 | 12949.99235 |
| 100 | 25899.9847 |
| 500 | 129499.9235 |
| 1000 | 258999.847 |
About Square Mile (US Survey) (mi² (US))
Definition
The US survey square mile is a historical area unit based on the US survey foot, equal to approximately 2,589,998.47 m².
Mathematical Relationship
1 mi² (US) ≈ 2,589,998.47 m². Differs from international mi² (2,589,988.11 m²) by about 10.36 m².
Conversion Formula
To convert US survey mi² to km²: multiply by 2.590. To international mi²: multiply by ~1.000004.
Practical Applications
Historical US Public Land Survey System sections (each nominally 1 mi² US survey).
Interesting Facts
Over one square mile, the US survey definition differs from the international definition by about 10.4 m² — roughly a 3 m × 3.5 m room.
Common Mistakes
Using the US survey mile for new calculations. Deprecated since 2023 — use the international definitions.
Educational Tips
The US Survey system was a legacy from 1893. Its 2023 retirement unified US measurements with the international standard.
About Square Hectometer (hm²)
Definition
The square hectometer is a metric unit of area equal to 10,000 square meters — also known as a hectare.
Mathematical Relationship
1 hm² = 10,000 m² = 1 ha = 100 are = 0.01 km².
Conversion Formula
To convert hm² to acres: multiply by 2.471. To km²: divide by 100. To m²: multiply by 10,000.
Practical Applications
Farm sizes, vineyard areas, national park land parcels, and urban development projects.
Interesting Facts
A standard FIFA football pitch is about 0.7 ha. The Louvre Museum covers about 6 ha.
Common Mistakes
Not realizing hm² and hectare are the same thing. Also, confusing hectare (area) with hectometer (length).
Educational Tips
A hectare = a square 100 m × 100 m. Picture a large athletic field — that's roughly 1 hectare.