Square miles to square kilometers
Type a value in mi² to get it in km² instantly.
259km²
That's 4.4× as big as Manhattan, while Luxembourg is 10× bigger. As a square plot, that is 16,090 m on each side.
Convert the other way: km² to mi²
What it means
How big is that?
Reference areas are typical values. A football pitch varies by stadium; this uses 105 × 68 m.
The math
How to convert mi² to km²
To convert square miles to square kilometers, multiply by 2.58999.
Example: 100 mi² × 2.58999 = 258.999 km².
In the other direction, 1 km² = 0.386102 mi².
Every unit
Your area in every unit
Tables
mi² to km² conversion table
| mi² | km² |
|---|---|
| 1 mi² | 2.58999 km² |
| 2 mi² | 5.17998 km² |
| 5 mi² | 12.9499 km² |
| 10 mi² | 25.8999 km² |
| 15 mi² | 38.8498 km² |
| 20 mi² | 51.7998 km² |
| 25 mi² | 64.7497 km² |
| 30 mi² | 77.6996 km² |
| 50 mi² | 129.499 km² |
| 75 mi² | 194.249 km² |
| 100 mi² | 258.999 km² |
| 150 mi² | 388.498 km² |
| 200 mi² | 517.998 km² |
| 500 mi² | 1,294.99 km² |
| 1,000 mi² | 2,589.99 km² |
| 5,000 mi² | 12,949.9 km² |
km² to mi² conversion table
| km² | mi² |
|---|---|
| 1 km² | 0.386102 mi² |
| 2 km² | 0.772204 mi² |
| 5 km² | 1.93051 mi² |
| 10 km² | 3.86102 mi² |
| 15 km² | 5.79153 mi² |
| 20 km² | 7.72204 mi² |
| 25 km² | 9.65255 mi² |
| 30 km² | 11.5831 mi² |
| 50 km² | 19.3051 mi² |
| 75 km² | 28.9577 mi² |
| 100 km² | 38.6102 mi² |
| 150 km² | 57.9153 mi² |
| 200 km² | 77.2204 mi² |
| 500 km² | 193.051 mi² |
| 1,000 km² | 386.102 mi² |
| 5,000 km² | 1,930.51 mi² |
Quick answers
Quick answers
- How many km² is 1 mi²?
- 1 mi² is 2.58999 km².
- How many km² is 10 mi²?
- 10 mi² is 25.8999 km².
- How many km² is 100 mi²?
- 100 mi² is 258.999 km².
The units
About these units
Square miles (mi²)
A square mile is 640 acres, about 2.59 km². US counties and land grants are laid out in square-mile sections.
Square kilometers (km²)
A square kilometer is 100 hectares, or a million square meters. Cities, lakes and countries are measured in it.
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