# Convert square kilometers to square miles

Enter the number of square kilometers you want to convert to square miles in the text box below. The conversion to area in square miles will update as you type.

square kilometers (km2)
1 square kilometers = 0.386 square miles

## Precise decimal and fraction answers

The conversion in square miles rounded to six significant decimal places is 1 km2 = 0.386102 sq mi. The precise fraction answer is 839/2173 sq mi.

### Decimal Precision

Conversion from one to ten decimal places

• 1 km2 = 0.4 sq mi
• 1 km2 = 0.39 sq mi
• 1 km2 = 0.386 sq mi
• 1 km2 = 0.3861 sq mi
• 1 km2 = 0.38610 sq mi
• 1 km2 = 0.386102 sq mi
• 1 km2 = 0.3861022 sq mi
• 1 km2 = 0.38610216 sq mi
• 1 km2 = 0.386102159 sq mi
• 1 km2 = 0.3861021585 sq mi

## Square kilometers to square miles conversion factor and formulas

Formula

The conversion factor between square kilometers and square miles is 2.59. This represents the ratio of square kilometers per one square mile. To calculate the value in square miles, we can either divide by the conversion factor or multiply by its inverse.

### Division

To convert from square kilometers to square miles, divide square kilometers by 2.59.
The formula is expressed as:
km2 ÷ 2.59 = sq mi

### Multiplication

Alternatively we can multiply by the inverse conversion factor to get the same result.
The inverse of 2.59 is 1/2.59 or 0.386. To convert from square kilometers to square miles, multiply square kilometers by 0.386.
The formula is expressed as:
km2 × 0.386 = sq mi

Converting square kilometers to square miles is a conversion between units from separate unit systems - square kilometers are metric (SI) defined units while square miles are US Customary / UK Imperial .

## Reverse this conversion

Convert from square miles to square kilometers instead.

## 1 square kilometers to other area units

### Metric

• 1 km2 = 100 ha
• 1 km2 = 1 km2
• 1 km2 = 1,000,000 m2
• 1 km2 = 1×108 dm2
• 1 km2 = 1×1010 cm2
• 1 km2 = 1×1012 mm2
• 1 km2 = 1×1018 µ2
• 1 km2 = 1×1024 nm2

### Imperial/U.S.

• 1 km2 = 247.105 acre
• 1 km2 = 0.386 sq mi
• 1 km2 = 1,195,990.046 sq yd
• 1 km2 = 1.076×107 sq ft
• 1 km2 = 1.55×109 sq in

## References and Citations

1. International Bureau of Weights and Measures (BIPM) The International System of Units (SI)
2. National Institute of Standards and Technology (NIST) General Tables of Units of Measurement

## Square kilometers to square miles conversion table

km2 sq mi
1 km2 0.386 sq mi
2 km2 0.772 sq mi
3 km2 1.158 sq mi
4 km2 1.544 sq mi
5 km2 1.931 sq mi
6 km2 2.317 sq mi
7 km2 2.703 sq mi
8 km2 3.089 sq mi
9 km2 3.475 sq mi
10 km2 3.861 sq mi
km2 sq mi
20 km2 7.722 sq mi
30 km2 11.583 sq mi
40 km2 15.444 sq mi
50 km2 19.305 sq mi
60 km2 23.166 sq mi
70 km2 27.027 sq mi
80 km2 30.888 sq mi
90 km2 34.749 sq mi
100 km2 38.61 sq mi
1,000 km2 386.102 sq mi