How to convert square miles to square kilometers
Formula: km² = mi² × 2.58999
Worked example: 1 mi² → 1 × 2.58999 = 2.58999 km²
Divide square kilometers by 2.58999 to get square miles. A city of 100 km² covers about 38.6 square miles. Remember that the factor is the length factor squared: 1.609344² = 2.58999.
Square miles to square kilometers conversion chart
| Square miles (mi²) | Square kilometers (km²) |
|---|---|
| 1 mi² | 2.58999 km² |
| 2 mi² | 5.17998 km² |
| 3 mi² | 7.76996 km² |
| 4 mi² | 10.36 km² |
| 5 mi² | 12.9499 km² |
| 6 mi² | 15.5399 km² |
| 7 mi² | 18.1299 km² |
| 8 mi² | 20.7199 km² |
| 9 mi² | 23.3099 km² |
| 10 mi² | 25.8999 km² |
| 12 mi² | 31.0799 km² |
| 15 mi² | 38.8498 km² |
| 20 mi² | 51.7998 km² |
| 25 mi² | 64.7497 km² |
| 30 mi² | 77.6996 km² |
| 40 mi² | 103.6 km² |
| 50 mi² | 129.499 km² |
| 75 mi² | 194.249 km² |
| 100 mi² | 258.999 km² |
| 250 mi² | 647.497 km² |
| 500 mi² | 1,294.99 km² |
| 1,000 mi² | 2,589.99 km² |
What is a square mile?
The square mile equals 640 acres, about 2.59 km². It measures the area of US cities, counties and states, and in the public land survey a one-square-mile parcel is called a section.
What is a square kilometer?
The square kilometer equals one million square meters, or 100 hectares. It measures cities, lakes, parks and countries; Manhattan covers about 59 km² of land. One square kilometer is about 0.386 square mile.