Square Kilometer to Square Mile Converter
Convert Square Kilometer (km²) to Square Mile (mi²) instantly. 1 km² = 0.386102 mi².
Area Converter
20 units available
1 km² = 0.386102 mi²
Formula:
mi² = km² × 0.3861021585With your value: 1 km² = 0.38610216 mi²
How big is that?
Everyday references on a logarithmic scale, all expressed in square kilometer so you can sanity-check the result.
Other Square Kilometer to Square Mile conversions
Square Kilometer to Square Mile Conversion Table
| Square Kilometer (km²) | Square Mile (mi²) |
|---|---|
| 0.5 | 0.193051 |
| 1 | 0.386102 |
| 2 | 0.772204 |
| 5 | 1.930511 |
| 10 | 3.861022 |
| 15 | 5.791532 |
| 20 | 7.722043 |
| 25 | 9.652554 |
| 50 | 19.305108 |
| 100 | 38.610216 |
| 250 | 96.52554 |
| 500 | 193.051079 |
| 1000 | 386.102159 |
Square Mile to Square Kilometer Conversion Table
| Square Mile (mi²) | Square Kilometer (km²) |
|---|---|
| 0.5 | 1.294994 |
| 1 | 2.589988 |
| 2 | 5.179976 |
| 5 | 12.949941 |
| 10 | 25.899881 |
| 15 | 38.849822 |
| 20 | 51.799762 |
| 25 | 64.749703 |
| 50 | 129.499406 |
| 100 | 258.998811 |
| 250 | 647.497028 |
| 500 | 1,294.994055 |
| 1000 | 2,589.98811 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Square Kilometer (km²)
Area
Derived from the square metre via the length definitions above.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
Square Mile (mi²)
Area
Derived from the square metre via the length definitions above.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
How to Convert Square Kilometer to Square Mile
To convert from Square Kilometer (km²) to Square Mile (mi²), multiply the value by 0.3861021585.
Formula: mi² = km² × 0.3861021585
Reverse: km² = mi² × 2.5899881103
Step-by-Step Example
- Start with your value in Square Kilometer. For example: 5 km²
- Multiply by the conversion factor: 5 x 0.3861021585
- The result is: 1.930511 mi²
About Square Kilometer
The square kilometer (km²) is a unit of area. One square kilometer equals 1.000000 × 10^+6 square metres. UnitConvertLab converts it against every other area unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
Common uses: area calculations, engineering and science, education.
About Square Mile
The square mile equals 640 acres or about 2.59 square kilometres, and is the standard unit for US county, city and land-survey areas.
Common uses: census areas, land surveys, geography.
Frequently Asked Questions
How many Square Mile are in 1 Square Kilometer?
There are exactly 0.3861021585 Square Mile in 1 Square Kilometer. This means the conversion factor from Square Kilometer to Square Mile is 0.3861021585.
What is the formula to convert Square Kilometer to Square Mile?
The formula to convert Square Kilometer to Square Mile is: mi² = km² × 0.3861021585. For example, to convert 10 Square Kilometer to Square Mile, you would multiply 10 by 0.3861021585.
What is a Square Kilometer?
The square kilometer (km²) is a unit of area. One square kilometer equals 1.000000 × 10^+6 square metres. UnitConvertLab converts it against every other area unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
What is a Square Mile?
The square mile equals 640 acres or about 2.59 square kilometres, and is the standard unit for US county, city and land-survey areas.
What are the common uses of Square Kilometer?
The Square Kilometer is commonly used in area calculations, engineering and science, education.
Related Area Conversions
Cite this page
UnitConvertLab. (2026). Square Kilometer to Square Mile converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/sqkilometer-to-sqmile