AI Calculator Tool

Square Kilometers to Square Miles Converter

Convert km² to sq mi: divide by 2.589988. 1 sq mi ≈ 2.59 km². Free calculator for maps and regional area.

How to Convert Square kilometer to Square mile

Divide square kilometers by 2.58998811.

Conversion Formula:

value / 2.58998811

Conversion Examples

Example: 2.59 km² to sq mi

  1. 2.589988 ÷ 2.589988 ≈ 1 sq mi

≈ 1 sq mi

Inverse of 1 mi².

Example: 10 km² to sq mi

  1. 10 ÷ 2.589988 ≈ 3.86 sq mi

≈ 3.86 sq mi

Town scale.

Conversion Chart

Square kilometerSquare mile
1.290.5
2.591
5.182
12.955
25.910
51.820
129.550
259100
647.5250
1295500

Conversion Formula

km² ÷ 2.58998811 = sq mi

Quick Conversion Tip

Divide km² by ~2.59 for square miles.

Unit Definitions

Square Kilometer (km²)

A square kilometer is a metric unit of area equal to the area of a square with sides measuring one kilometer. It equals 1,000,000 square meters and is commonly used for large geographic areas, cities, and counties.

1 square kilometer = 0.386102 square miles = 1,000,000 square meters = 100 hectares = 247.105 acres

Square Mile (mi²)

A square mile is an imperial unit of area equal to the area of a square with sides measuring one mile. It equals 640 acres and is commonly used for large geographic areas, cities, and counties.

1 square mile = 2.58998811 square kilometers = 640 acres = 27,878,400 square feet = 3,097,600 square yards

Common Use Cases

  • US reports from metric sources.
  • Comparing country sizes.
  • Aviation and weather in familiar units.
  • Education and trivia.

Understanding the Conversion

1 sq mi = 2.58998811 km². Divide km² by 2.589988 for sq mi.

Examples: 2.59 km² ≈ 1 sq mi · 25.9 km² ≈ 10 sq mi · 1 km² ≈ 0.386 sq mi.

When metric GIS or country data needs US-style square miles.

US reports from metric sources. The table and FAQ on this page walk through the factor if you need it.

FAQs

How do you convert km² to sq mi?

Divide by 2.58998811. Example: 5 km² ÷ 2.59 ≈ 1.93 sq mi.

How many sq mi is 1 km²?

About 0.386 square miles (1 ÷ 2.589988).

Which is larger, 1 km² or 1 sq mi?

One square mile is larger—about 2.59 km² per sq mi.