CALCULATOR
Square Miles to Square Kilometers Converter
Convert square miles to square kilometers. For example, 2.5 mi² equals 6.47497027584 km². Enter a nonnegative value up to 1,000,000,000 to update the result.
How the calculation works
Square Kilometers = Square Miles × (632321316/244140625).
Worked example
With square miles 1 mi², square kilometers is 2.58998811 km².
Assumptions and limits
International-acre basis43560international ft²; not historical US survey acre or jurisdictional land registry.