Square kilometers to Square miles Converter km² → mi²

1 square kilometer (km²) = 0.3861021585 square miles (mi²). Type a value below — the conversion happens instantly, entirely on your device.

From

1 km² = 0.3861021585 mi²

Precision

1 square kilometers = 0.38610216 square miles

1 × 0.386102 = 0.38610216

1 km² equals 0.386102 mi², so multiplying by 0.386102 converts the value. The result describes the exact same quantity — only the measuring stick changes.

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How to convert square kilometers to square miles

square miles = square kilometers × 0.3861021585 — multiply the square kilometer value by 0.386102.

Example: 10 km² = 3.86102 mi².

To convert the other way: square kilometers = square miles ÷ 0.3861021585 — or use the dedicated mi² to km² converter .

Square kilometers to Square miles conversion table

Square kilometers (km²)	Square miles (mi²)
0.1	0.038610216
0.25	0.09652554
0.5	0.19305108
1	0.38610216
2	0.77220432
3	1.1583065
4	1.5444086
5	1.9305108
6	2.316613
7	2.7027151
8	3.0888173
9	3.4749194
10	3.8610216
15	5.7915324
20	7.7220432
25	9.652554
30	11.583065
40	15.444086
50	19.305108
75	28.957662
100	38.610216
250	96.52554
500	193.05108
1000	386.10216

About the units

What is a square kilometer?

A square kilometer (km²) is one million square meters (100 hectares). City and country areas are measured in square kilometers.

What is a square mile?

A square mile (mi²) is 640 acres, about 2.59 km². It is used for large land areas such as cities and counties in the US and UK.

Frequently asked questions

How many square miles are in 1 square kilometer?

1 square kilometer (km²) = 0.3861021585 square miles (mi²).

What is the formula to convert square kilometers to square miles?

square miles = square kilometers × 0.3861021585 — multiply the square kilometer value by 0.386102.

How do I convert km² to mi² without a calculator?

Multiply by 0.386 for a close estimate. Exact factor: 1 km² = 0.3861021585 mi².

Is this km²-to-mi² converter accurate and private?

Yes. It uses the exact internationally defined conversion factors and computes results locally in your browser — your input is never sent to a server, and the page keeps working offline.