Convert square miles to square kilometers
1 mi² = 2.58998811034 km² — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
2.589 988 110 34km²
Exact decimal: 2.589988110336
As a fraction: 632321316/244140625
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1 mi² = 2.58998811034 km²
Show this value in all 25 area units
- Square kilometers km² 2.589 988 110 34
- Square hectometers hm² 258.998 811 034
- Square decameters dam² 25 899.881 103 4
- Square meters m² 2 589 988.110 34
- Square decimeters dm² 258 998 811.034
- Square centimeters cm² 25 899 881 103.4
- Square millimeters mm² 2 589 988 110 340
- Square micrometers µm² 2.58998811034e+18
- Square nanometers nm² 2.58998811034e+24
- Hectares ha 258.998 811 034
- Ares a 25 899.881 103 4
- Decares daa 2589.988 110 34
- Square inches in² 4 014 489 600
- Square feet ft² 27 878 400
- Square yards yd² 3 097 600
- Square miles mi² 1
- Acres ac 640
- Roods ro 2560
- Square rods rd² 102 400
- Sections section 1
- Townships twp 0.027 777 777 777 8
- Roofing squares sq 278 784
- Circular mils cmil 5 111 406 910 650 000
- Barns b 2.58998811034e+34
- Tsubos 坪 783 471.403 377
Every row is Square mile (mi²) converted through the square meter, in exact rational arithmetic.
How to convert square miles to square kilometers
Multiply the number of square miles by 2.58998811034 to get square kilometers.
The exact factor is 2.589988110336 — as a fraction, 632321316/244140625.
Square mile to Square kilometer conversion table
| Square miles (mi²) | Square kilometers (km²) |
|---|---|
| 1 mi² | 2.589 988 1 |
| 2 mi² | 5.179 976 2 |
| 3 mi² | 7.769 964 3 |
| 5 mi² | 12.949 941 |
| 10 mi² | 25.899 881 |
| 20 mi² | 51.799 762 |
| 25 mi² | 64.749 703 |
| 50 mi² | 129.499 41 |
| 100 mi² | 258.998 81 |
| 250 mi² | 647.497 03 |
| 500 mi² | 1294.9941 |
| 1000 mi² | 2589.9881 |
Square kilometer to Square mile conversion table
| Square kilometers (km²) | Square miles (mi²) |
|---|---|
| 1 km² | 0.386 102 16 |
| 2 km² | 0.772 204 32 |
| 3 km² | 1.158 306 5 |
| 5 km² | 1.930 510 8 |
| 10 km² | 3.861 021 6 |
| 20 km² | 7.722 043 2 |
| 25 km² | 9.652 554 |
| 50 km² | 19.305 108 |
| 100 km² | 38.610 216 |
| 250 km² | 96.525 54 |
| 500 km² | 193.051 08 |
| 1000 km² | 386.102 16 |
Frequently asked
How many square kilometers are in a square mile?
One square mile equals 2.58998811 square kilometers (mi² → km²). That figure is exact, not rounded.
How do you convert square miles to square kilometers?
Multiply the number of square miles by 2.58998811034 to get square kilometers.
What is 1 km² in square miles?
One square kilometer is 0.3861021585 square miles.
What is 10 mi² in km²?
10 mi² = 25.899 881 km².