1 square mile = 2.58998811 square kilometers
All conversions
| Unit | Symbol | Value |
|---|
Quick answer
To convert square miles to square kilometers, multiply the number of square miles by 2.58999. For example, 0.5 square miles = 1.29499 square kilometers.
How to Convert Square Miles to Square KM
The formula is square kilometers = square miles × 2.58998811. 1 square mile = 2.58998811 square kilometers. Type any value in the converter above for an instant answer, or use the chart below for the most common values.
This page is preset for square mile to square kilometer conversions, but you can switch either list to any of the 39 units in the Area Converter, or go the other way with the Square KM to Square Miles converter.
Square Miles to Square KM conversion chart
| Square Miles | Square KM |
|---|---|
| 0.1 mi² | 0.25899881 km² |
| 0.25 mi² | 0.64749703 km² |
| 0.5 mi² | 1.2949941 km² |
| 1 mi² | 2.5899881 km² |
| 2 mi² | 5.1799762 km² |
| 3 mi² | 7.7699643 km² |
| 4 mi² | 10.359952 km² |
| 5 mi² | 12.949941 km² |
| 6 mi² | 15.539929 km² |
| 7 mi² | 18.129917 km² |
| 8 mi² | 20.719905 km² |
| 9 mi² | 23.309893 km² |
| 10 mi² | 25.899881 km² |
| 11 mi² | 28.489869 km² |
| 12 mi² | 31.079857 km² |
| 13 mi² | 33.669845 km² |
| 14 mi² | 36.259834 km² |
| 15 mi² | 38.849822 km² |
| 16 mi² | 41.43981 km² |
| 17 mi² | 44.029798 km² |
| 18 mi² | 46.619786 km² |
| 19 mi² | 49.209774 km² |
| 20 mi² | 51.799762 km² |
| 25 mi² | 64.749703 km² |
| 30 mi² | 77.699643 km² |
| 40 mi² | 103.59952 km² |
| 50 mi² | 129.49941 km² |
| 60 mi² | 155.39929 km² |
| 70 mi² | 181.29917 km² |
| 75 mi² | 194.24911 km² |
| 80 mi² | 207.19905 km² |
| 90 mi² | 233.09893 km² |
| 100 mi² | 258.99881 km² |
| 150 mi² | 388.49822 km² |
| 200 mi² | 517.99762 km² |
| 250 mi² | 647.49703 km² |
| 500 mi² | 1,294.9941 km² |
| 640 mi² | 1,657.5924 km² |
| 1,000 mi² | 2,589.9881 km² |
Common Square Miles to Square KM conversions
- 1 square mile = 2.58998811 square kilometers
- 0.5 mi² = 1.2949941 km²
- 1 mi² = 2.5899881 km²
- 10 mi² = 25.899881 km²
- 100 mi² = 258.99881 km²
- 640 mi² = 1,657.5924 km²
Popular area converters
How to Use the Square Miles to Square KM Converter
- Type a value in the From box and choose its unit.
- Pick the unit you want in the To list — the result updates as you type.
- Use the swap button to reverse the conversion, or type in the To box to convert backwards.
- Check the All conversions table to see your value in every unit; click a row to make it the target.
Frequently Asked Questions
How many square kilometers are in a square mile?
There are 2.58998811 square kilometers in 1 square mile. Going the other way, 1 square kilometer = 0.3861021585 square miles.
How do I convert Square Miles to Square KM?
Use the formula square kilometers = square miles × 2.58998811. For example, 1 square mile = 2.58998811 square kilometers. Or type the value in the converter above and the answer appears as you type.
What is the Square Miles to Square KM formula?
square kilometers = square miles × 2.58998811 — the factor is rounded to 10 significant figures, which is far more precise than everyday use needs.
What is 0.5 square miles in square kilometers?
0.5 square miles = 1.2949941 square kilometers.
What is 1 square mile in square kilometers?
1 square mile = 2.5899881 square kilometers.
What is 10 square miles in square kilometers?
10 square miles = 25.899881 square kilometers.
What is 100 square miles in square kilometers?
100 square miles = 258.99881 square kilometers.
What is 640 square miles in square kilometers?
640 square miles = 1,657.5924 square kilometers.
How do I convert Square KM back to Square Miles?
Use the swap button in the converter above, or open our Square KM to Square Miles converter. square miles = square kilometers × 0.3861021585.
Is this Square Miles to Square KM converter accurate?
Yes. It uses exact unit definitions and double-precision maths, and you can show up to 15 significant digits. The table below is calculated with the same formula.
Can I convert Square Miles to other area units?
Yes — pick any unit in the From and To lists above, or open the full Area Converter, which handles 39 area units.
Is the Square Miles to Square KM converter free?
Yes, it is free with no sign-up, and every conversion runs in your browser so nothing is sent to a server.