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Square Kilometers to Square Miles Converter (km² to mi²)

1 km² = 0.3861021585 mi². Type any value to convert square kilometers to square miles.

1 km² = 0.3861021585 mi²

Formula: mi² = km² ÷ 2.58998811

Common values
Decimals
In every unit 12 units
Square millimeter (mm²) 1,000,000,000,000 mm²
Square centimeter (cm²) 10,000,000,000 cm²
Square meter (m²) 1,000,000 m²
Are (a) 10,000 a
Dunam (dunam) 1,000 dunam
Hectare (ha) 100 ha
Square kilometer (km²) 1 km²
Square inch (in²) 1,550,003,100 in²
Square foot (ft²) 10,763,910.42 ft²
Square yard (yd²) 1,195,990.046 yd²
Acre (ac) 247.1053815 ac
Square mile (mi²) 0.3861021585 mi²

Convert on our server?

If you continue, the file is uploaded over an encrypted connection and converted on our server. You can keep using the site meanwhile. The original is deleted as soon as it is converted; the result is kept for 6 hours so you can download it, and you can delete it at any time. Files are never shared or used for anything else.

Calculated in your browser – nothing you type is sent anywhere. Privacy details

Square kilometers to square miles table

Formula: mi² = km² ÷ 2.58998811

Square kilometer (km²)Square mile (mi²)
0.1 km²0.03861021585 mi²
0.25 km²0.09652553964 mi²
0.5 km²0.1930510793 mi²
1 km²0.3861021585 mi²
2 km²0.7722043171 mi²
3 km²1.158306476 mi²
4 km²1.544408634 mi²
5 km²1.930510793 mi²
6 km²2.316612951 mi²
7 km²2.70271511 mi²
8 km²3.088817268 mi²
9 km²3.474919427 mi²
10 km²3.861021585 mi²
12 km²4.633225903 mi²
15 km²5.791532378 mi²
20 km²7.722043171 mi²
25 km²9.652553964 mi²
30 km²11.58306476 mi²
40 km²15.44408634 mi²
50 km²19.30510793 mi²
60 km²23.16612951 mi²
75 km²28.95766189 mi²
100 km²38.61021585 mi²
150 km²57.91532378 mi²
200 km²77.22043171 mi²
250 km²96.52553964 mi²
500 km²193.0510793 mi²
1,000 km²386.1021585 mi²

How to use: Square Kilometers to Square Miles

  1. 1 Type the value in square kilometers.
  2. 2 The result in square miles appears at once – or type in the square miles field to convert back.
  3. 3 Pick a common value, round to fewer decimals or swap the units with one click.
  4. 4 Copy the result, or open “In every unit” to see the value in all units of area.

About this tool

Square kilometer (km²) is a unit of area (SI); 1 km² = 1,000,000 m². Square mile (mi²) is a unit of area (imperial and US customary); 1 mi² = 2,589,988.11 m².

To convert square kilometers to square miles, divide the value by 2.58998811 (mi² = km² ÷ 2.58998811). Example: 50 km² = 19.30510793 mi².

Calculated in your browser – nothing you type is sent anywhere.

Frequently asked questions

How do I convert square kilometers to square miles?

To convert square kilometers to square miles, divide the value by 2.58998811: mi² = km² ÷ 2.58998811. For example 50 km² = 19.30510793 mi².

What is 1 km² in square miles?

1 km² = 0.3861021585 mi². The other way round, 1 mi² = 2.58998811 km².

How exact is the result?

The converter uses the official definitions of both units and shows up to 10 significant digits; choose 0–6 decimals to round. Both units are defined exactly in terms of each other, so the factor itself is exact.

Can I convert other units of area here?

Yes – choose any of the 12 units of area in the From and To lists, or switch to another measurement at the top.

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