Square Miles to Square Kilometers
( mi² → km² )
Instantly convert square miles to square kilometers. Enter any value below and get an accurate result with the full formula and reference table.
How to Convert Square Miles to Square Kilometers
To convert square miles to square kilometers, multiply the number of square miles by 2.589988110336. This is because one square mile equals the area of a square with sides of one mile (1 mile = 1.609344 kilometers).
Step-by-Step Example
Let’s convert 2 square miles to square kilometers:
1. Multiply by 2.589988110336: 2 × 2.589988110336 = 5.179976220672
2. So 2 mi² equals approximately 5.18 km².
For a smaller amount, 0.5 mi² × 2.589988110336 = 1.294994055168 km².
When You’d Use Each Unit
Square miles are used for measuring large areas such as cities, counties, and countries, especially in the United States and the United Kingdom. Square kilometers are the standard unit for area in the metric system, used worldwide for everything from cities to countries. Converting between them is essential for international comparisons, geography, and real estate.
Common square miles values converted to square kilometers — typical values highlighted.
| mi² | km² | Approximate |
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