1 Square Kilometer to Square Miles

1 km² ≈ 0.3861 mi²

Calculation: mi² = 1 km² × 0.386102 ≈ 0.3861 mi²

Square Kilometer to Square Mile Converter

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How big is 1 km²?

247.11 acres (10,763,910 sq ft) is a very large area, comparable to a major ranch or industrial site.

How to Convert Square Kilometer to Square Mile

1 square kilometer = 0.386102 square miles exact

Square Mile = Square Kilometer × 0.386102

Example: 1 km² × 0.386102 = 0.3861 mi²

Reverse Conversion

To convert square miles back to square kilometers:

  • Remember, 1 square mile equals 2.58999 square kilometers.
  • To convert 0.3861 mi² to km², multiply 0.3861 x 2.58999, resulting in 1 km².

exact This conversion factor is exact by international definition.

1 km² is also equal to:

  • 1000000 square meter
  • 100 hectare
  • 1.0764 × 107 square foot
  • 247.11 acre
About these units

Square kilometer: km² — The square kilometer is an SI-derived unit of area equal to exactly 1,000,000 m² (one million square meters).

Square mile: mi² — The square mile is a unit of area in the US customary and British imperial systems.

Frequently Asked Questions

How much is 1 square kilometer in square miles?

1 square kilometer equals 0.3861 square miles. This is calculated by multiplying 1 by the conversion factor 0.386102.

What does 1 square kilometer look like in square miles?

1 square kilometer (0.3861 square miles) is a small city district or a large park.

How do you calculate 1 square kilometer to square miles?

Multiply 1 by the conversion factor 0.386102. The calculation is 1 × 0.386102 = 0.3861 square miles. This factor is defined by international measurement standards.

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1 square kilometer = 0.386102 square miles
1 square kilometer = 0.386102 square miles — conversion chart

Nearby Conversions

2 square kilometers0.7722 square miles 3 square kilometers1.158 square miles 4 square kilometers1.544 square miles 5 square kilometers1.931 square miles 6 square kilometers2.317 square miles 7 square kilometers2.703 square miles 8 square kilometers3.089 square miles 9 square kilometers3.475 square miles 10 square kilometers3.861 square miles 11 square kilometers4.247 square miles

For general conversions between square kilometers and square miles, see the square kilometers to square miles converter.

Also convert Square Kilometers to:

Conversion factors verified against NIST, BIPM, ISO 80000-3 Derived from SI base units (m², BIPM). Last reviewed: March 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes

All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.