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Square Miles to Square Kilometers (mi² to km²) Converter

1 square mile (mi²) = 2.58999 square kilometers (km²). To convert square miles to square kilometers, multiply by 2.58999: 25 mi² × 2.58999 = 64.7497 km². Also searched as square miles to square kilometres.

1 mi² = 2.5899881103 km²
Convert the other way: Square Kilometers to Square Miles

Quick facts

How to convert square miles to square kilometers

  1. Take the value in square miles.
  2. Multiply it by 2.58999 (the number of square kilometers in one square mile).
  3. Round the result to the precision you need.
km² = mi² × 2.58999

Worked example: 25 mi² × 2.58999 = 64.7497 km².

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

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

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

mi² to km² chart from 1 to 100

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

Square Miles vs Square Kilometers

Square MileSquare Kilometer
Symbolmi²km²
Equals1 mi² = 2.58999 km²1 km² = 0.386102 mi²

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.

What is a square kilometer?

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

Frequently asked questions

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 many square miles are in a square kilometer?

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

How do I convert square miles to square kilometers?

Multiply the number of square miles by 2.58999. For example, 10 mi² × 2.58999 = 25.8999 km². To convert back, multiply by 0.386102.

What is 10 mi² in square kilometers?

10 mi² = 25.8999 km².

What is 100 mi² in square kilometers?

100 mi² = 258.999 km².

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