Square Kilometers to Square Miles
A square kilometer is one million square meters, used for city, country, and large land area comparisons. A square mile is 640 acres, used to describe the area of cities, counties, and large regions in the US. 1 km² equals ≈0.386102 mi², so converting between them is a matter of multiplying by that fixed factor — type any value into the converter below and both sides update instantly as you type.
Both units belong to area, measured here against area's base unit (m²) — every other area unit on this site converts through that same reference point, which is why the table below can also be read as a quick cross-check against nearby values.
Formula
mi² = km² × ≈0.386102
km² = mi² × ≈2.58999
Worked example: 5 km² × ≈0.386102 = ≈1.93051 mi².
Conversion table
| Square Kilometer (km²) | Square Mile (mi²) |
|---|---|
| 1 km² | ≈0.386102 mi² |
| 2 km² | ≈0.772204 mi² |
| 3 km² | ≈1.15831 mi² |
| 5 km² | ≈1.93051 mi² |
| 10 km² | ≈3.86102 mi² |
| 20 km² | ≈7.72204 mi² |
| 25 km² | ≈9.65255 mi² |
| 50 km² | ≈19.3051 mi² |
| 100 km² | ≈38.6102 mi² |
| 250 km² | ≈96.5255 mi² |
| 500 km² | ≈193.051 mi² |
| 1,000 km² | ≈386.102 mi² |
Frequently asked
- How many Square Miles in a square kilometer?
- 1 km² equals ≈0.386102 mi².
- How do I convert Square Kilometers to Square Miles?
- Multiply the value in km² by ≈0.386102 to get mi². The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Square Kilometer and Square Mile are both defined by a fixed conversion factor to area's base unit (m²), so the result shown is exact to the precision displayed, not an approximation.