Hectare to Square Mile (US Survey) Converter
Unit Converter
Instant · Precise · Universal
23 units available
6 categories total
How to Convert Hectare to Square Mile (US Survey)
To convert ha to acres: multiply by 2.471. To km²: divide by 100. To m²: multiply by 10,000.
1 ha = 10,000 m² = 100 a = 0.01 km² ≈ 2.471 acres.
For example, 1 Hectare (ha) = 0.003861006141 Square Mile (US Survey) (mi² (US)).
Hectare to Square Mile (US Survey) — Common Values
| Hectare (ha) | Square Mile (US Survey) (mi² (US)) |
|---|---|
| 0.1 | 0.0003861006141 |
| 0.5 | 0.001930503071 |
| 1 | 0.003861006141 |
| 2 | 0.007722012283 |
| 5 | 0.01930503071 |
| 10 | 0.03861006141 |
| 25 | 0.09652515353 |
| 50 | 0.1930503071 |
| 100 | 0.3861006141 |
| 500 | 1.930503071 |
| 1000 | 3.861006141 |
About Hectare (ha)
Definition
The hectare is a metric unit of area equal to 10,000 square meters, or 100 ares — the area of a square 100 meters on each side.
Mathematical Relationship
1 ha = 10,000 m² = 100 a = 0.01 km² ≈ 2.471 acres.
Conversion Formula
To convert ha to acres: multiply by 2.471. To km²: divide by 100. To m²: multiply by 10,000.
Practical Applications
Farm sizes, vineyard areas, forestry management, urban planning zones, and national park boundaries.
Interesting Facts
Singapore has a total area of about 72,800 ha. The Amazon rainforest loses about 1 million ha per year to deforestation.
Common Mistakes
Confusing hectare with acre — a hectare is about 2.47 acres, not equal to one. Also, 1 km² = 100 ha, not 1,000.
Educational Tips
A hectare = 100 m × 100 m. A football field is about 0.7 ha. Two football fields ≈ 1.4 ha — close to 1 ha.
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.