Convert area units — square meters, square feet, acres, hectares, cents, grounds and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 mi² | 0.258999 ha | |
| 0.01 mi² | 2.58999 ha | |
| 0.1 mi² | 25.8999 ha | |
| 1 mi² | 258.999 ha | |
| 5 mi² | 1294.99 ha | |
| 10 mi² | 2589.99 ha | |
| 50 mi² | 12949.9 ha | |
| 100 mi² | 25899.9 ha | |
| 1000 mi² | 258999 ha |
Common square mile values converted to hectare — factor: 1 mi² = 259 ha
| Square Mile (mi²) | Hectare (ha) | Context |
|---|---|---|
| 0.001 mi² | 0.259 ha | City park |
| 0.01 mi² | 2.59 ha | Airport |
| 0.1 mi² | 25.9 ha | Suburb |
| 0.5 mi² | 129.5 ha | Small town |
| 1 mi² | 259 ha | Small town |
| 2 mi² | 518 ha | Small town |
| 5 mi² | 1,295 ha | Medium town |
| 10 mi² | 2,590 ha | Small city |
| 25 mi² | 6,475 ha | Large city |
| 50 mi² | 1.295e+04 ha | Large city |
| 100 mi² | 2.59e+04 ha | Metro area |
| 250 mi² | 6.475e+04 ha | County |
| 500 mi² | 1.295e+05 ha | County |
| 1,000 mi² | 2.59e+05 ha | Small state |
| 5,000 mi² | 1,295,000 ha | Large state |
Converting square mile to hectare is common in real estate, agriculture, surveying, and construction. Property listings, land records, and planning documents often use different area units depending on the country or industry — making accurate conversion essential for cross-border transactions and international comparisons.
As a practical reference: 5 mi² = 1295 hectare and 10 mi² = 2590 hectare. For larger land areas, 100 mi² = 2.59e+04 hectare — a common benchmark for farm and estate valuations. The reverse: 1 ha = 0.003861 mi².
All conversions use the internationally recognized factor of exactly 1 mi² = 259 ha. Calculations are performed in IEEE 754 double-precision floating point, giving accuracy to at least 8 significant figures — more than sufficient for any practical application.
Formula: Hectare = Square Mile × 258.9988
Multiply any square mile value by 258.9988 to get hectare. One square mile equals 258.9988 ha.
Reverse: Square Mile = Hectare × 0.0038610217
1 mi² = 258.9988 ha. Memorize this for instant mental estimates.
Use 258.9988 as a quick mental multiplier for square miles to hectares.
To verify: multiply your result by 0.0038610217 to recover the original mi² value.
Measures and compares geographic region sizes in square miles.
Reports population density in people per square mile.
Tracks fire perimeter and burned area in square miles.
Assesses large land parcels in square miles for master-planned communities.
Defines operational theater and patrol areas in square miles.
Describes scale of disasters and developments in square miles for US audiences.
The square mile is an Imperial unit equal to 640 acres or about 2.59 km². It is used for measuring large territories, cities, and geographic features in the US and UK.
US census data reports city and county areas in square miles. The term 'square mile' also colloquially refers to the City of London financial district.
Interesting fact: Manhattan island in New York City covers about 23 square miles. The entire US is approximately 3.8 million square miles.
The hectare is a metric unit equal to 10,000 m² or 2.471 acres, defined in 1795 as part of the French metric system. The name comes from the Latin area and the Greek hekaton (hundred).
Hectares are the global standard for agricultural land measurement, forest inventories, nature reserves, and urban planning across metric countries.
Interesting fact: One hectare of wheat can produce about 3-8 tonnes of grain. The Amazon rainforest covers roughly 550 million hectares.