Convert square kilometer (km²) to square mile (mi²).
AreaOpen
Square Mile to Square Kilometer Converter (sq mi to sq km)
Convert square mile (mi²) to square kilometer (km²).Unit Converter · Area
Quick answer
1 square mile (sq mi) is approximately equal to 2.589988 square kilometers (sq km). 1 square kilometer (sq km) is approximately equal to 0.3861022 square miles (sq mi).
To convert sq mi to sq km, multiply the value in square miles by 2.5899881103. For example, 10 sq mi = 25.8998811 sq km, and 100 sq mi = 258.99881103 sq km.
Loading chart…
Quick reference — square mile to square kilometer
More in Area
All Area convertersConvert square mile (mi²) to square meter (m²).
AreaOpenConvert square mile (mi²) to square foot (ft²).
AreaOpenConvert square mile (mi²) to acre (acre).
AreaOpenConvert square mile (mi²) to hectare (ha).
AreaOpenConvert square mile (mi²) to square yard (yd²).
AreaOpenConvert square mile (mi²) to square centimeter (cm²).
AreaOpenConvert square mile (mi²) to square inch (in²).
AreaOpenConvert square mile (mi²) to square millimeter (mm²).
AreaOpen
How to convert square miles to square kilometers
How many square kilometers are in a square mile? 1 square mile is about 2.589988 square kilometers. This free mi² to km² converter and square mile to square kilometer calculator gives the answer instantly for any value, and the same conversion is also written as square mile to square kilometre and sq mi to sq km.
To convert square mile (mi²) to square kilometer (km²), multiply the value in square miles by 2.5899881103.
km² = mi² × 2.5899881103
- 1
Take the value in square miles
For example, 25 mi².
- 2
Multiply by 2.5899881103
25 × 2.5899881103.
- 3
Read the answer in square kilometers
25 mi² = 64.74970276 km².
Square Mile to Square Kilometer conversion table
Common values from 1 to 1,000 square miles converted to square kilometers.
| Square Mile (mi²) | Square Kilometer (km²) |
|---|---|
| 1 mi² | 2.58998811 km² |
| 2 mi² | 5.17997622 km² |
| 3 mi² | 7.76996433 km² |
| 4 mi² | 10.35995244 km² |
| 5 mi² | 12.94994055 km² |
| 6 mi² | 15.53992866 km² |
| 7 mi² | 18.12991677 km² |
| 8 mi² | 20.71990488 km² |
| 9 mi² | 23.30989299 km² |
| 10 mi² | 25.8998811 km² |
| 15 mi² | 38.84982166 km² |
| 20 mi² | 51.79976221 km² |
| 25 mi² | 64.74970276 km² |
| Square Mile (mi²) | Square Kilometer (km²) |
|---|---|
| 30 mi² | 77.69964331 km² |
| 40 mi² | 103.59952441 km² |
| 50 mi² | 129.49940552 km² |
| 60 mi² | 155.39928662 km² |
| 70 mi² | 181.29916772 km² |
| 75 mi² | 194.24910828 km² |
| 80 mi² | 207.19904883 km² |
| 90 mi² | 233.09892993 km² |
| 100 mi² | 258.99881103 km² |
| 250 mi² | 647.49702758 km² |
| 500 mi² | 1,294.99405517 km² |
| 1,000 mi² | 2,589.98811034 km² |
About square miles and square kilometers
Square Mile (mi²)
A square mile is 640 acres, about 2.59 square kilometers. It is used for large land areas in the US and UK.
Square Kilometer (km²)
A square kilometer (km²) is 1,000,000 square meters, or 100 hectares. It is used for the area of cities, districts and countries.
mi² to km²: common questions
- How many square kilometers are in 1 square mile?
- 1 square mile (sq mi) is approximately equal to 2.589988 square kilometers (sq km). In short: 1 sq mi ≈ 2.589988 sq km.
- How do I convert square miles to square kilometers?
- To convert mi² to km², multiply the value in square miles by 2.5899881103. For example, 5 mi² = 12.94994055 km².
- How do I convert square kilometers to square miles?
- To convert km² to mi², divide the value in square kilometers by 2.5899881103. Or open the Square Kilometer to Square Mile converter, which does it for you.
- What is 10 mi² in km², and what is 100 mi²?
- 10 mi² = 25.8998811 km², and 100 mi² = 258.99881103 km². The table above lists more values from 1 to 1,000.
- Is this mi² to km² converter accurate?
- Yes. It uses the exact conversion factor and shows results to as many as 8 decimal places, so you can rely on it for study, work and everyday measuring.
Square Kilometer to Square Mile converter →All Area converters →
Customize this calculator
Pick a look, copy the code, and this Square Mile to Square Kilometer calculator — with its inputs and results — runs on your own website.
Theme color
Match your brand's colors
Corner style
Sharp, soft or fully rounded
Widget width
Compact, standard or full width
Live preview
Full widthThe same inputs, result and chart as the calculator above, styled with your choices.
yoursite.com