Convert area units — square meters, acres, hectares, square feet, square kilometers.
| Unit | Name | Value |
|---|---|---|
| m² | Square Meter | 2589990 |
| km² | Square Kilometer | 2.58999 |
| ha | Hectare | 258.999 |
| ac | Acre | 639.9999 |
| ft² | Square Foot | 27878432 |
| yd² | Square Yard | 3097603.6 |
Common square mile values converted to square kilometer — factor: 1 mi² = 2.59 km²
| Square Mile (mi²) | Square Kilometer (km²) | Context |
|---|---|---|
| 0.1 mi² | 0.259 km² | Suburb |
| 0.25 mi² | 0.6475 km² | Small town |
| 0.5 mi² | 1.295 km² | Small town |
| 1 mi² | 2.59 km² | Small town |
| 2 mi² | 5.18 km² | Small town |
| 5 mi² | 12.95 km² | Medium town |
| 10 mi² | 25.9 km² | Small city |
| 20 mi² | 51.8 km² | Small city |
| 25 mi² | 64.75 km² | Large city |
| 50 mi² | 129.5 km² | Large city |
| 100 mi² | 259 km² | Metro area |
| 250 mi² | 647.5 km² | County |
| 500 mi² | 1,295 km² | County |
| 1,000 mi² | 2,590 km² | Small state |
| 5,000 mi² | 1.295e+04 km² | Large state |
Converting square mile to square kilometer 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 = 12.95 square kilometer and 10 mi² = 25.9 square kilometer. For larger land areas, 100 mi² = 259 square kilometer — a common benchmark for farm and estate valuations. The reverse: 1 km² = 0.3861 mi².
All conversions use the internationally recognized factor of exactly 1 mi² = 2.59 km². 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: Square Kilometer = Square Mile × 2.589988
Multiply any square mile value by 2.589988 to get square kilometer. One square mile equals 2.589988 km².
Reverse: Square Mile = Square Kilometer × 0.38610217
mi² × 2.59 = km². Round to × 2.6 for quick estimates.
One square mile is about 2.6 square kilometers.
km² × 0.386 = mi².
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 square kilometer is equal to one million square meters, used for measuring large geographic areas such as countries, forests, lakes, and urban regions.
It became the standard measure for national territories and natural features as cartography evolved in the 19th and 20th centuries alongside the metric system.
Interesting fact: The world's smallest country, Vatican City, covers just 0.44 km². Russia, the largest, spans about 17.1 million km².