Convert square miles to square kilometers
square miles to square kilometers. Enter a value to convert, or use the square miles to square kilometers chart further down the page.
1 square mile equals 2.58999 square kilometers. Going the other way, 1 square kilometer = 0.386102 square miles.
How to convert square miles to square kilometers
To convert square miles to square kilometers, multiply the square mile value by 2.58998811. You can also divide by 0.3861021585 to get the same answer.
km² = mi² × 2.58998811
Worked example
Convert 15 mi² to square kilometers:
15 mi² = 38.8498 km²
square miles to square kilometers conversion chart
Use this square miles to square kilometers table for quick reference without typing anything.
| square miles (mi²) | square kilometers (km²) |
|---|---|
| 0.01 mi² | 0.0258999 km² |
| 0.1 mi² | 0.258999 km² |
| 1 mi² | 2.58999 km² |
| 2 mi² | 5.17998 km² |
| 3 mi² | 7.76996 km² |
| 5 mi² | 12.9499 km² |
| 10 mi² | 25.8999 km² |
| 20 mi² | 51.7998 km² |
| 50 mi² | 129.499 km² |
| 100 mi² | 258.999 km² |
| 1,000 mi² | 2,589.99 km² |
What is a square mile?
A square mile is exactly 640 acres, or about 2.59 square kilometers. It is the unit used for US county and city areas.
What is a square kilometer?
A square kilometer is one million square meters, or 100 hectares. It is the standard unit for the area of towns, lakes and countries.
Frequently asked questions
How many square kilometers are in a square mile?
1 square miles equals 2.58999 square kilometers. Going the other way, 1 square kilometers is 0.386102 square miles.
How do you convert square miles to square kilometers?
To convert square miles to square kilometers, multiply the square mile value by 2.58998811. You can also divide by 0.3861021585 to get the same answer.
What is 10 square miles in square kilometers?
10 square miles equals 25.8999 square kilometers. The conversion chart on this page lists the other values people look up most often.
Related area conversions
Convert square miles to other units
- square kilometers to square miles
- square miles to square meters
- square miles to square feet
- square miles to acres
- square miles to hectares
- square miles to square yards
- square miles to square inches
- square miles to square centimeters
Convert other units to square kilometers
- square meters to square kilometers
- square feet to square kilometers
- acres to square kilometers
- hectares to square kilometers
- square yards to square kilometers
- square inches to square kilometers
- square centimeters to square kilometers
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