Square Kilometers to Square Miles Converter
Convert km² to sq mi: divide by 2.589988. 1 sq mi ≈ 2.59 km². Free calculator for maps and regional area.
How to Convert Square kilometer to Square mile
Divide square kilometers by 2.58998811.
Conversion Formula:
value / 2.58998811Conversion Examples
Example: 2.59 km² to sq mi
- 2.589988 ÷ 2.589988 ≈ 1 sq mi
≈ 1 sq mi
Inverse of 1 mi².
Example: 10 km² to sq mi
- 10 ÷ 2.589988 ≈ 3.86 sq mi
≈ 3.86 sq mi
Town scale.
Conversion Chart
| Square kilometer | Square mile |
|---|---|
| 1.29 | 0.5 |
| 2.59 | 1 |
| 5.18 | 2 |
| 12.95 | 5 |
| 25.9 | 10 |
| 51.8 | 20 |
| 129.5 | 50 |
| 259 | 100 |
| 647.5 | 250 |
| 1295 | 500 |
Conversion Formula
km² ÷ 2.58998811 = sq mi
Quick Conversion Tip
Divide km² by ~2.59 for square miles.
Unit Definitions
Square Kilometer (km²)
A square kilometer is a metric unit of area equal to the area of a square with sides measuring one kilometer. It equals 1,000,000 square meters and is commonly used for large geographic areas, cities, and counties.
1 square kilometer = 0.386102 square miles = 1,000,000 square meters = 100 hectares = 247.105 acres
Square Mile (mi²)
A square mile is an imperial unit of area equal to the area of a square with sides measuring one mile. It equals 640 acres and is commonly used for large geographic areas, cities, and counties.
1 square mile = 2.58998811 square kilometers = 640 acres = 27,878,400 square feet = 3,097,600 square yards
Common Use Cases
- US reports from metric sources.
- Comparing country sizes.
- Aviation and weather in familiar units.
- Education and trivia.
Understanding the Conversion
1 sq mi = 2.58998811 km². Divide km² by 2.589988 for sq mi.
Examples: 2.59 km² ≈ 1 sq mi · 25.9 km² ≈ 10 sq mi · 1 km² ≈ 0.386 sq mi.
When metric GIS or country data needs US-style square miles.
US reports from metric sources. The table and FAQ on this page walk through the factor if you need it.
FAQs
How do you convert km² to sq mi?
Divide by 2.58998811. Example: 5 km² ÷ 2.59 ≈ 1.93 sq mi.
How many sq mi is 1 km²?
About 0.386 square miles (1 ÷ 2.589988).
Which is larger, 1 km² or 1 sq mi?
One square mile is larger—about 2.59 km² per sq mi.