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Square Kilometers to Square Miles Converter

1 square kilometer = 0.3861021585 mi². Enter any value to convert square kilometers (km²) to square miles (mi²), or use the table below for common values.

Results

1 km² =0.3861021585 mi²square kilometers → square miles
1 km²0.3861021585 mi²
1 mi²2.58998811 km²
Formula
mi² = km² × 0.3861021585
1 km² in other units
UnitValue
square meters (m²)1,000,000
square inches (in²)1,550,003,100
square feet (ft²)10,763,910.42
square yards (yd²)1,195,990.046
square miles (mi²)0.3861021585
acres (ac)247.1053815
hectares (ha)100

Formula

mi² = km² × 0.3861021585

Example: 10 km² = 3.861021585 mi². To convert the other way, use km² = mi² × 2.58998811.

Quick mental estimate: multiply by about 0.39.

Square Kilometers to Square Miles conversion table

Square Kilometers (km²)Square Miles (mi²)
1 km²0.3861021585 mi²
2 km²0.7722043171 mi²
3 km²1.158306476 mi²
4 km²1.544408634 mi²
5 km²1.930510793 mi²
6 km²2.316612951 mi²
7 km²2.70271511 mi²
8 km²3.088817268 mi²
9 km²3.474919427 mi²
10 km²3.861021585 mi²
15 km²5.791532378 mi²
20 km²7.722043171 mi²
25 km²9.652553964 mi²
30 km²11.58306476 mi²
40 km²15.44408634 mi²
50 km²19.30510793 mi²
75 km²28.95766189 mi²
100 km²38.61021585 mi²
250 km²96.52553964 mi²
500 km²193.0510793 mi²
1,000 km²386.1021585 mi²

About square kilometers and square miles

The square kilometer equals one million square meters, used for the areas of cities, countries and lakes.

The square mile is 640 acres, used for large land areas such as counties and national parks in the US.

Other Area conversions

Square Miles → Square KilometersReverse conversionSquare Meters → Square Milesm² → mi²Square Kilometers → Square Meterskm² → m²Square Kilometers → Square Incheskm² → in²Square Kilometers → Square Feetkm² → ft²Square Kilometers → Square Yardskm² → yd²Square Kilometers → Acreskm² → acSquare Kilometers → Hectareskm² → haSquare Inches → Square Milesin² → mi²Square Feet → Square Milesft² → mi²Square Yards → Square Milesyd² → mi²Acres → Square Milesac → mi²Hectares → Square Milesha → mi²

Frequently asked questions

How do I convert square kilometers to square miles?

Use the formula mi² = km² × 0.3861021585. For example, 10 km² = 3.861021585 mi².

What is 1 square kilometer in square miles?

1 km² = 0.3861021585 mi².

How do I convert square miles back to square kilometers?

Use km² = mi² × 2.58998811. 1 mi² = 2.58998811 km².