Convert square miles to square km
Type the number of square miles that you wish to convert to square kilometers.
How to Convert Square Miles to Square Kilometers
The square mile and square kilometer are both units of area. 1 square mile equals 2.5899881103 square kilometers. This means to convert square miles to square kilometers, you multiply by 2.5899881103.
Formula
Step-by-Step Example
Convert 5 mi² to square kilometers:
We need to convert square miles to square kilometers
Since 1 mi² = 2.5899881103 km², multiply by 2.5899881103
5 × 2.5899881103 = 12.949940552
5 mi² = 12.949940552 km²
Square Mile to Square Kilometer Conversion Table
Quick reference table for common square mile to square kilometer conversions. Click any value for detailed calculation.
| Square Miles (mi²) | Square Kilometers (km²) |
|---|---|
| 1 mi² | 2.5899881103 km² |
| 2 mi² | 5.1799762207 km² |
| 5 mi² | 12.949940552 km² |
| 10 mi² | 25.899881103 km² |
| 15 mi² | 38.849821655 km² |
| 20 mi² | 51.799762207 km² |
| 25 mi² | 64.749702758 km² |
| 50 mi² | 129.49940552 km² |
| 100 mi² | 258.99881103 km² |
About These Units
Square Mile (mi²)
A square mile (mi² or sq mi) equals 640 acres, 2.59 square kilometers, or 27,878,400 square feet. Square miles measure city sizes, counties, and states in the US. Manhattan is about 23 square miles. One section of land (US survey) equals one square mile.
Square Kilometer (km²)
A square kilometer (km²) equals 1,000,000 square meters, 100 hectares, or approximately 247.1 acres. Square kilometers measure country sizes, city areas, and large geographic regions. New York City covers about 783 km². One square mile equals 2.59 km².
Frequently Asked Questions
How do I convert square miles to square kilometers?
To convert square miles to square kilometers, multiply the value by 2.5899881103. For example, 10 mi² = 25.899881103 km².
How many square kilometers are in 1 square mile?
1 square mile equals 2.5899881103 square kilometers.
What is the formula for square miles to square kilometers?
The formula is: km² = mi² × 2.5899881103.