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Square Kilometers to Square Miles (km² to mi²) Converter

1 square kilometer (km²) = 0.386102 square miles (mi²). To convert square kilometers to square miles, multiply by 0.386102: 25 km² × 0.386102 = 9.65255 mi². Also searched as square kilometres to square miles.

1 km² = 0.3861021585 mi²
Convert the other way: Square Miles to Square Kilometers

Quick facts

How to convert square kilometers to square miles

  1. Take the value in square kilometers.
  2. Multiply it by 0.386102 (the number of square miles in one square kilometer).
  3. Round the result to the precision you need.
mi² = km² × 0.386102

Worked example: 25 km² × 0.386102 = 9.65255 mi².

To convert square miles back to square kilometers, multiply by 2.58999, or divide by 0.386102.

Source: NIST SP 811 (2008). Marla and kanal use the Punjab standard stated in their definitions; local sizes can differ.

Square Kilometers to Square Miles conversion table

Square Kilometers to Square Miles conversion table
Square Kilometers [km²]Square Miles [mi²]
0.01 km²0.0038610216 mi²
0.1 km²0.0386102159 mi²
1 km²0.3861021585 mi²
2 km²0.7722043171 mi²
3 km²1.1583064756 mi²
5 km²1.9305107927 mi²
10 km²3.8610215854 mi²
20 km²7.7220431708 mi²
50 km²19.3051079271 mi²
100 km²38.6102158542 mi²
1000 km²386.1021585424 mi²

km² to mi² chart from 1 to 100

Square Miles to Square Kilometers conversion table

Square Miles to Square Kilometers conversion table
Square Miles [mi²]Square Kilometers [km²]
0.01 mi²0.0258998811 km²
0.1 mi²0.258998811 km²
1 mi²2.5899881103 km²
2 mi²5.1799762207 km²
3 mi²7.769964331 km²
5 mi²12.9499405517 km²
10 mi²25.8998811034 km²
20 mi²51.7997622067 km²
50 mi²129.4994055168 km²
100 mi²258.9988110336 km²
1000 mi²2589.988110336 km²

Square Kilometers vs Square Miles

Square KilometerSquare Mile
Symbolkm²mi²
Equals1 km² = 0.386102 mi²1 mi² = 2.58999 km²

What is a square kilometer?

The area of a square with 1-kilometer sides. Used for city, country, and large geographic areas.

What is a square mile?

The area of a square with 1-mile sides. Used in the US and UK for large land areas and population density.

Frequently asked questions

How many square miles are in a square kilometer?

There are 0.386102 square miles in 1 square kilometer (1 km² = 0.3861021585 mi²).

How many square kilometers are in a square mile?

There are 2.58999 square kilometers in 1 square mile (1 mi² = 2.5899881103 km²).

How do I convert square kilometers to square miles?

Multiply the number of square kilometers by 0.386102. For example, 10 km² × 0.386102 = 3.86102 mi². To convert back, multiply by 2.58999.

What is 10 km² in square miles?

10 km² = 3.86102 mi².

What is 100 km² in square miles?

100 km² = 38.6102 mi².

Is the conversion exact?

Yes. The factor comes from the official definitions of both units (NIST SP 811 (2008). Marla and kanal use the Punjab standard stated in their definitions; local sizes can differ). Results are shown to up to 10 decimal places; round them to suit your purpose.

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Reviewed by

Dr. Muhammad Amjad Khadim PhD Mathematics

Dr. Muhammad Amjad Khadim holds a PhD in Mathematics. He writes and reviews the guides on pakmath.com and checks every formula, conversion factor and worked example against published standards and official guidance before it goes live. Spotted an error? Tell us and it will be corrected.

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First published 28 October 2026 · Last reviewed 5 November 2026