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Square Miles to Square Kilometers

Convert square miles to square kilometers. 1 square mile = 2.58999 square kilometers.

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1 Square Mile (mi²) = 2.5899881 Square Kilometer (km²)

2.5899881

1 Square Mile (mi²) = 2.5899881 Square Kilometer (km²)

Quick Reference

Square Mile (mi²)
Square Kilometer (km²)
0.1
0.25899881
0.5
1.2949941
1
2.5899881
2
5.1799762
5
12.949941
10
25.899881
20
51.799762
50
129.49941

Frequently Asked Questions

1 Square Mile (mi²) = 2.5899881 Square Kilometer (km²). Convert square miles to square kilometers. 1 square mile = 2.58999 square kilometers.
Use the converter above. Enter any value in the Square Mile (mi²) field and the result in Square Kilometer (km²) appears instantly.
Conversions use precise factor-based math with up to 8 significant figures. Results are rounded for display only.
Yes — all unit conversions work entirely in your browser with no internet connection required.