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Square Kilometers to Square Miles Converter

Convert square kilometers (km²) to square miles (sq mi), with the formula, a conversion table and exact factors.

Change the values and press Calculate to work out your own figures.

Enter an area, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.

A number, fraction (3/8), mixed number (1 1/2), scientific notation (2.5e6) or a simple sum such as 2*3.
The unit you want the answer in. Swap exchanges the two units.
Result
0.386102158542 sq mi
acres
247.105381467 ac
square yards
1,195,990.0463 sq yd
square feet
10,763,910.4167 sq ft
square inches
1,550,003,100.01 sq in
hectares
100 ha
ares
10,000 a
square meters
1,000,000 m²
square centimeters
10,000,000,000 cm²
square millimeters
1,000,000,000,000 mm²
square micrometers
1 × 10¹⁸ µm²

1 km² = 0.386102158542 sq mi

Show the working
  1. 1 km² = 0.386102158542 sq mi
  2. 1 × 0.386102158542 = 0.386102158542 sq mi

How to convert square kilometers to square miles

1 km² = 0.386102158542 sq mi, so multiply by 0.386102158542 to go from square kilometers to square miles. Going the other way, 1 sq mi = 2.58998811034 km².

sq mi = km² × 0.386102158542
km² = sq mi × 2.58998811034

Worked example:

1 km² = 0.386102158542 sq mi
5 × 0.386102158542 = 1.93051079271 sq mi

Square Kilometers to square miles table

Square KilometersSquare Miles
1 km²0.386102158542 sq mi
2 km²0.772204317085 sq mi
3 km²1.15830647563 sq mi
4 km²1.54440863417 sq mi
5 km²1.93051079271 sq mi
6 km²2.31661295125 sq mi
7 km²2.7027151098 sq mi
8 km²3.08881726834 sq mi
9 km²3.47491942688 sq mi
10 km²3.86102158542 sq mi
15 km²5.79153237814 sq mi
20 km²7.72204317085 sq mi
25 km²9.65255396356 sq mi
30 km²11.5830647563 sq mi
40 km²15.4440863417 sq mi
50 km²19.3051079271 sq mi
75 km²28.9576618907 sq mi
100 km²38.6102158542 sq mi
250 km²96.5255396356 sq mi
500 km²193.051079271 sq mi
1000 km²386.102158542 sq mi

About the units

Square Kilometers (km²)
Square kilometers, a metric unit. Definition: BIPM SI Brochure (SI prefixes).
Square Miles (sq mi)
Square miles, a US customary unit. Definition: NIST Handbook 44 Appendix C (derived from the international mile).

Formula version 0.1.0Reviewed