Square Miles to Square Km Converter
Unit ConversionConvert square miles to square kilometers. 1 square mile equals exactly 2.589988110336 square kilometers, with a conversion table, worked examples and the reverse conversion.
Square Kilometers
Equivalent area in square kilometers
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SponsoredThis converter turns square miles into square kilometers (sq mi to sq km). Enter a value and the result updates as you type. 1 square mile equals exactly 2.589988110336 square kilometers.
Square miles and square kilometers both measure large areas such as countries, states, lakes and parks. A mile is 1.609344 kilometers, so a square mile is that number squared, about 2.59 square kilometers. Rounding the mile to 1.61 first gives 2.5921, a small but avoidable error.
The result is rounded to 4 decimal places, but the factor behind it never is, so long chains of conversions stay accurate. You can type decimals, thousands separators or fractions such as 2 1/2, and the conversion table below lists common values.
How to Convert Square Miles to Square Kilometers
To convert square miles to square kilometers, multiply by 2.589988110336. For example, 10 square miles equals exactly 25.89988110336 square kilometers.
To go from square kilometers back to square miles, divide by 2.589988110336. For example, 10 square kilometers is about 3.861 square miles.
Square Miles to Square Kilometers Conversion Table
Common values in square miles converted to square kilometers, rounded to 4 decimal places.
| Square Miles | Square Kilometers |
|---|---|
| 0.5 mi² | 1.295 km² |
| 1 mi² | 2.59 km² |
| 2 mi² | 5.18 km² |
| 5 mi² | 12.9499 km² |
| 10 mi² | 25.8999 km² |
| 25 mi² | 64.7497 km² |
| 50 mi² | 129.4994 km² |
| 100 mi² | 258.9988 km² |
| 250 mi² | 647.497 km² |
| 1,000 mi² | 2,589.9881 km² |
How Many Square Kilometers in a Square Mile
For a rough figure, multiply square miles by 2.59, or multiply square kilometers by 0.386 to go back. A square mile is about 258.9988 hectares, and a square kilometer is 100 hectares.
The length steps behind these numbers are in the Kilometers to Miles Converter. The side of a square with a given area is its square root, so a square of 100 square miles is 10 miles across; the Square Root Calculator finds it for any area.
Frequently Asked Questions
How many square kilometers is 40 square miles?
40 square miles equals exactly 103.59952441344 square kilometers.
How many square kilometers is 3 square miles?
3 square miles equals exactly 7.769964331008 square kilometers.
How do I convert square miles to square kilometers in Excel?
With the value in cell A2, use =A2*2.589988110336. Format the cell to show the decimals you need; Excel keeps the full value behind the display.
How many square kilometers is 12 square miles?
12 square miles equals exactly 31.079857324032 square kilometers.
What happens if I enter a negative number?
The result shows a dash. An area is a size, so it is never below zero; a negative value usually means a typing mistake, such as a stray minus sign.
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