Square mile to Square kilometer Converter
1 square mile is exactly 2.589988110336 square kilometers. Convert square miles (mi²) to square kilometers (km²) below: type a value and the result updates as you type.
mi² to km² calculator
Result
Square mile to Square kilometer conversion
1 mi² = 2.589988110336 km²one square mile in square kilometers
1 km² ≈ 0.3861021585 mi²one square kilometer in square miles
Square mile (mi²): A square one international mile on each side.
Square kilometer (km²): A square one kilometer on each side.
Source:Square mile: International yard and pound agreement (1959); Square kilometer: SI Brochure, 9th edition (BIPM, 2019)
How to convert square miles to square kilometers
To convert square miles to square kilometers, multiply the number of square miles by 2.589988110336.
Formula
km² = mi² × 2.589988110336
Examples
- 5 mi² = 5 × 2.589988110336 = 12.94994055168 km²
- 25 mi² = 25 × 2.589988110336 = 64.7497027584 km²
- 100 mi² = 100 × 2.589988110336 = 258.9988110336 km²
Square mile to Square kilometer conversion table
| Square mile (mi²) | Square kilometer (km²) |
|---|---|
| 0.1 mi² | 0.2589988110336 km² |
| 0.5 mi² | 1.294994055168 km² |
| 1 mi² | 2.589988110336 km² |
| 2 mi² | 5.179976220672 km² |
| 3 mi² | 7.769964331008 km² |
| 5 mi² | 12.94994055168 km² |
| 10 mi² | 25.89988110336 km² |
| 20 mi² | 51.79976220672 km² |
| 25 mi² | 64.7497027584 km² |
| 50 mi² | 129.4994055168 km² |
| 100 mi² | 258.9988110336 km² |
| 250 mi² | 647.497027584 km² |
| 500 mi² | 1294.994055168 km² |
| 1000 mi² | 2589.988110336 km² |
Values rounded to 10 significant digits where needed.
Frequently asked questions
- How many square kilometers are in one square mile?
- One square mile is exactly 2.589988110336 square kilometers.
- How do I convert square kilometers to square miles?
- To convert square kilometers to square miles, divide the number of square kilometers by 2.589988110336. The formula is mi² = km² ÷ 2.589988110336.
- Is this conversion exact?
- Yes. Both units have exact definitions and the factor 2.589988110336 is exact. Displayed results are only rounded when they have many decimal places.
- Which is larger, a square mile or a square kilometer?
- A square mile is 2.589988110336 times larger than a square kilometer. In other words, a square kilometer is about 0.3861021585 of a square mile.