Area
square miles to km² Converter
1 mi² = 2.59 km². Enter any value and the result updates instantly.
Convert
Accuracy and rounding
Useful for rooms, land, materials, and drawings. Area conversions square the length factor, so they are not the same as length conversions.
Area units are derived from fixed length definitions. The factor is squared, so area conversions are not the same as length conversions.
For rooms and land, round after multiplying by quantity or price. Small rounding errors can grow on large areas.
How to convert square miles to km²
- Type the square miles value in the calculator.
- Keep square miles selected as the from unit and km² selected as the to unit.
- Use the instant result, or copy it with the copy button.
square miles to km² chart
| square miles | km² |
|---|---|
| 1 mi² | 2.59 km² |
| 2 mi² | 5.18 km² |
| 5 mi² | 12.9499 km² |
| 10 mi² | 25.8999 km² |
| 25 mi² | 64.7497 km² |
| 50 mi² | 129.5 km² |
| 100 mi² | 259 km² |
Formula
km² = mi² x 2.589988110336
Example: 1 mi² = 2.59 km².
Source
Area units derived from exact length definitions; acre and hectare factors are fixed.
Common questions
How do I convert square miles to km²?
Enter the square miles value in the converter, or multiply by the factor shown in the formula. 1 mi² = 2.59 km².
What should I watch out for?
Area conversions square the length relationship, so they are different from plain length conversions.
Where does this area conversion come from?
Area units derived from exact length definitions; acre and hectare factors are fixed. ConverterBase uses stable definitions and fixed conversion factors, not live or rounded market data.