Square Miles to Square km Converter
Convert square miles to square kilometers and back instantly with bidirectional real-time results.
Square Miles to Square km Converter
The Square Miles to Square km Converter converts between mi² and km² instantly. One square mile equals approximately 2.59 km². Useful for geography, land area, and mapping. See also Area Converter and Mile Converter.
Conversion Formula
$$\text{km}^2 = \text{mi}^2 \times 2.589988$$
$$\text{mi}^2 = \frac{\text{km}^2}{2.589988}$$
Frequently Asked Questions
How many km² are in 1 square mile?
One square mile equals approximately 2.589988 km², based on 1 mile = 1.609344 km squared.
How do I convert 10 mi² to km²?
Multiply by 2.589988: $10 \times 2.589988 \approx 25.9$ km².
How many mi² is 5 km²?
Divide by 2.589988: $5 \div 2.589988 \approx 1.93$ mi².
Is conversion bidirectional?
Yes. Edit either field for instant results.
Why is the factor not exactly 2.59?
The precise factor is $(1.609344)^2 = 2.589988110336$ km² per mi², derived from the international mile definition.
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