Convert Square Miles to Square Kilometers
One square mile equals 2.589988 square kilometers. Type any value to convert square miles to square kilometers instantly — with a full reference table below.
Convert Square Miles to Square Kilometers
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How to convert Square Miles to Square Kilometers
To convert square miles to square kilometers, multiply by 2.589988. One square mile equals 2.589988 km², and one square kilometer equals 0.386102 mi².
- Take the value in square miles — for example 7.5 mi².
- Multiply by 2.589988 (the number of square kilometers in one square mile).
- 7.5 × 2.589988 = 19.42491 km².
Quick mental estimate: Multiply the number of square miles by 2.6 (within 0.4% of the exact answer).
Square Miles to Square Kilometers conversion table
| Square Miles | Square Kilometers |
|---|---|
| 1 mi² | 2.589988 km² |
| 2 mi² | 5.179976 km² |
| 3 mi² | 7.769964 km² |
| 5 mi² | 12.94994 km² |
| 10 mi² | 25.89988 km² |
| 20 mi² | 51.79976 km² |
| 50 mi² | 129.4994 km² |
| 100 mi² | 258.9988 km² |
| 200 mi² | 517.9976 km² |
| 500 mi² | 1,294.994 km² |
| 1,000 mi² | 2,589.988 km² |
| 5,000 mi² | 12,949.94 km² |
| Square Kilometers | Square Miles |
|---|---|
| 1 km² | 0.386102 mi² |
| 2 km² | 0.772204 mi² |
| 3 km² | 1.158306 mi² |
| 5 km² | 1.930511 mi² |
| 10 km² | 3.861022 mi² |
| 20 km² | 7.722043 mi² |
| 50 km² | 19.30511 mi² |
| 100 km² | 38.61022 mi² |
| 200 km² | 77.22043 mi² |
| 500 km² | 193.0511 mi² |
| 1,000 km² | 386.1022 mi² |
| 5,000 km² | 1,930.511 mi² |
About converting Square Miles to Square Kilometers
Square Miles (mi²) and Square Kilometers (km²) are both units of area. The exact factor is 1 mi² = 2.589988 km², so multiply by 2.589988 to go from square miles to square kilometers (or divide to go back).
The conversion runs entirely in your browser. Need the reverse? Use the Square Kilometers to Square Miles converter, or the full unit converter for every unit at once.
Real-world area in square miles and square kilometers
| Example | Square Miles | Square Kilometers |
|---|---|---|
| A doubles tennis court (23.77 × 10.97 m) | 0.000100679 mi² | 0.000260757 km² |
| An NBA basketball court (94 × 50 ft) | 0.000168589 mi² | 0.000436644 km² |
| An American football field (incl. end zones) | 0.00206612 mi² | 0.00535122 km² |
| A football pitch (105 × 68 m) | 0.00275677 mi² | 0.00714 km² |
| One acre | 0.0015625 mi² | 0.00404686 km² |
“≈” marks typical values; the rest are defined or measured figures.
The units
A square 1 mile on each side: 640 acres, about 2.59 km².
Used for: US/UK land and city areas.
A square 1 km on each side — 1,000,000 m² or 100 hectares.
Used for: City, country and land areas.
Area factors are the squares of exact length factors, so they are exact too (an international acre is exactly 4,046.8564224 m²).