Sqmi to Sqkm ConverterRight in Your Browser
Convert square miles (sq mi) to square kilometers (km²). The square mile (sq mi) measures cities, counties and wilderness areas in the US and UK. The square kilometer (km²) measures cities, lakes and countries in the metric world. Everything is calculated locally in your browser — no server, and it works offline.
2.58999 km²
in square kilometers (square kilometer)
To convert square miles to square kilometers, multiply the square mile value by 2.58999.
Switch to Sqkm to SqmiSqmi to Sqkm Chart
| Square miles (sq mi) | Square kilometers (km²) |
|---|---|
| 1 | 2.58999 |
| 2 | 5.17998 |
| 3 | 7.76996 |
| 4 | 10.36 |
| 5 | 12.9499 |
| 10 | 25.8999 |
| 20 | 51.7998 |
| 50 | 129.499 |
| 100 | 258.999 |
Frequently Asked Questions
How many square kilometers are in a square mile?
One square mile equals 2.58999 square kilometers (1 sq mi = 2.58999 km²). So to go from square miles to square kilometers, multiply the square mile value by 2.58999.
What is the formula to convert square miles to square kilometers?
To convert square miles to square kilometers, multiply the square mile value by 2.58999. For example, 10 sq mi is 25.8999 km².
What is 10 square miles in square kilometers?
10 square miles — a small city — is 25.8999 square kilometers. The converter above works for any value, entirely in your browser.
Is the square mile to square kilometer conversion exact?
The factor used here is the defined value: 1 sq mi = 2.58998811 km². Results are rounded to six significant digits for readability, so for high-precision work use the full factor.