Square Kilometers to Square Miles

1 square kilometer = 0.3861021585 square miles. To convert square kilometers (km²) to square miles (mi²), multiply by 0.3861021585.

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How to convert square kilometers to square miles

mi² = km² × 0.3861021585

Example: convert 8 square kilometers to square miles.
8 km² × 0.3861021585 = 3.088817268 mi²

The same relationship in reverse: 1 square mile = 2.58998811 square kilometers, so you can also divide by 2.58998811. Need the other direction? Use the square miles to square kilometers converter.

You will typically need this conversion for the size of cities, countries and national parks.

Square Kilometers to Square Miles conversion chart

Square Kilometers (km²)Square Miles (mi²)
1 km²0.38610216 mi²
2 km²0.77220432 mi²
3 km²1.1583065 mi²
4 km²1.5444086 mi²
5 km²1.9305108 mi²
6 km²2.316613 mi²
7 km²2.7027151 mi²
8 km²3.0888173 mi²
9 km²3.4749194 mi²
10 km²3.8610216 mi²
15 km²5.7915324 mi²
20 km²7.7220432 mi²
25 km²9.652554 mi²
30 km²11.583065 mi²
40 km²15.444086 mi²
50 km²19.305108 mi²
75 km²28.957662 mi²
100 km²38.610216 mi²
250 km²96.52554 mi²
500 km²193.05108 mi²
1,000 km²386.10216 mi²

Values rounded to 8 significant figures. The converter above shows up to 12.

About the units

Square Kilometer (km²)

One million square meters. Used for the area of cities, countries and lakes.

Square Mile (mi²)

640 acres, about 2.59 km². Used for the area of US states, counties and cities.

Frequently asked questions

How many square miles are in a square kilometer?

1 square kilometer = 0.3861021585 square miles. Going the other way, 1 square mile = 2.58998811 square kilometers.

How do I convert square kilometers to square miles?

To convert square kilometers to square miles, multiply by 0.3861021585. The formula is mi² = km² × 0.3861021585.

What is 8 km² in mi²?

8 square kilometers is 3.088817268 square miles (8 km² × 0.3861021585 = 3.088817268 mi²).

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