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Convert Square Kilometers to Square Miles

Convert square kilometers to square miles instantly (Square Kilometers to Square Miles). 1 km² = 0.3861021585 mi².

Converter

square kilometer (km²)
square mile (mi²)

km² to mi² conversion table

Square kilometersSquare miles
1 km²0.38610216 mi²
2 km²0.77220432 mi²
5 km²1.9305108 mi²
10 km²3.8610216 mi²
25 km²9.652554 mi²
50 km²19.305108 mi²
100 km²38.610216 mi²
1000 km²386.10216 mi²

Formula

mi² = km² × 0.3861021585

Worked example

25 km² × 0.3861021585 = 9.652553964 mi²

Popular km² to mi² conversions

Quick answers for common values, each with its own formula and worked steps.

About square kilometers and square miles

Square kilometer (km²)

A square kilometer is 1,000,000 square meters. It is used for the area of cities, countries and large regions.

Square mile (mi²)

A square mile is 640 acres (about 2.59 square kilometers). It is used for the area of cities, parks and counties in the US and UK.

Both are units of area; the base unit used internally is m².

Notes

km² to mi² FAQs

How do I convert square kilometers to square miles?

Multiply the number of square kilometers by 0.3861021585 to get square miles. For example, 25 km² × 0.3861021585 = 9.65255 mi².

How many square miles are in one square kilometer?

1 km² = 0.3861021585 mi² and 1 mi² = 2.58998811 km². To go the other way, use the square miles to square kilometers converter.

How many square miles are in 10 square kilometers?

10 km² = 3.86102 mi², rounded to 6 significant digits. Change the value in the converter above for any other amount.

Is the km² to mi² conversion exact?

The ratio is exact by definition, but its decimal form does not end (0.386102158542… to 12 significant digits). The converter keeps full precision internally and rounds only the displayed answer, which you can set from 4 to 12 significant digits.

What is the difference between square kilometers and square miles?

A square kilometer is 1,000,000 square meters. It is used for the area of cities, countries and large regions. A square mile is 640 acres (about 2.59 square kilometers). It is used for the area of cities, parks and counties in the US and UK.

Why isn't the km² to mi² factor the same as km to mi?

Area scales with the square of length. 1 km = 0.6213711922 mi, so 1 km² = 0.6213711922² mi² = 0.3861021585 mi².

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