Square miles to Square kilometers Converter

Convert square miles to square kilometers instantly, with the formula and a mi² to km² conversion table. 🔒 Runs in your browser

Convert to all units

Square mile to square kilometer formula

km² = mi² × 2.58998811 · 1 square mile = 2.58998811 square kilometers

mi² to km² conversion table

square miles (mi²)square kilometers (km²)
1 mi²2.58998811 km²
2 mi²5.179976221 km²
3 mi²7.769964331 km²
5 mi²12.94994055 km²
10 mi²25.8998811 km²
20 mi²51.79976221 km²
25 mi²64.74970276 km²
50 mi²129.4994055 km²
100 mi²258.998811 km²
250 mi²647.4970276 km²
500 mi²1294.994055 km²
1000 mi²2589.98811 km²

Need the opposite? Use the square kilometers to square miles converter.

How to use the Square Miles to Square Kilometers converter

  1. Enter the value you want to convert.
  2. Pick the units to convert from and to (or click ⇄ to swap).
  3. Read the result instantly, with the formula and a full table below.

About this tool

Convert square miles to square kilometers instantly, with the formula and a mi² to km² conversion table. It is part of the free Converters collection on Online Tools Harbor. Everything happens locally in your browser, so it is fast and private.

Frequently asked questions

How do I convert square miles to square kilometers?

Use the formula km² = mi² × 2.58998811. For example, 3 mi² = 7.769964331 km².

How many square kilometers are in 1 square mile?

1 square mile = 2.58998811 square kilometers. To convert, multiply the value in square miles by 2.58998811.

Is the Square Miles to Square Kilometers free?

Yes. The Square Miles to Square Kilometers is completely free to use, with no sign-up and no limits on normal use.

Is my data safe?

Yes. This tool runs entirely in your web browser using JavaScript. Your text is never uploaded to our servers.

Does it work on mobile?

Yes, it works in any modern browser on phones, tablets and computers. No app to install.

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