Square miles to Square kilometers

Convert square miles to square kilometers. Live result, plus a quick-reference table for common values.

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⇆ Convert Square kilometers to Square miles instead

Frequently asked questions

How do I convert square miles to square kilometers?

Multiply the square mile value by 2.58999. So 1 square mile = 2.58999 km², and the calculator above does it instantly for any number.

How many square kilometers are in a square mile?

There are 2.58999 square kilometers in one square mile. The reference table shows the conversion for common values.

Is this mi² to km² converter free?

Yes, completely free, no sign-up, and it runs entirely in your browser, so nothing is uploaded.