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Square Miles to Square Kilometers Converter

Convert square miles to square kilometers and square kilometers to square miles instantly. Bidirectional area converter with formula and common values.

Square Miles to Square Kilometers: 1 sq mi equals 2.58999 km². To convert square miles to square kilometers, multiply by 2.58999 (km² = sq mi × 2.58999). For example, 10 sq mi = 25.8999 km².

3.5 sq mi = 9.065 km²

km² = sq mi × 2.58999

How to Convert Square Miles to Square Kilometers

To convert from square miles to square kilometers, multiply the value by 2.58999. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • Square Miles to Square Kilometers: km² = sq mi × 2.58999
  • Square Kilometers to Square Miles: sq mi = km² ÷ 2.58999
Square Miles to Square Kilometers conversion scale — a dual ruler showing 1 sq mi equals 2.59 km².
Square Miles to Square Kilometers conversion scale (sq mi to km²).

Square Miles to Square Kilometers Conversion Chart

Square Miles (sq mi)Square Kilometers (km²)
0.10.258999
0.250.647497
0.51.294995
12.58999
25.17998
37.76997
512.94995
1025.8999
2051.7998
2564.74975
50129.4995
100258.999
250647.4975
10002589.99

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FAQ

How many square kilometers is a square mile?

One square mile equals approximately 2.58999 square kilometers.

How do I convert square miles to square kilometers?

Multiply the number of square miles by 2.58999. For example, 3.5 sq mi × 2.58999 = 9.065 km².

How big is one square mile in metric terms?

One square mile equals 2.58999 km², 258.999 hectares, or 2,589,988 square meters.

What US city is about one square mile?

The City of London (the historic financial district) is about 1.12 sq mi (2.90 km²). Many small towns are close to one square mile.

How many square kilometers are in 1 square mil?

1 sq mi equals 2.58999 km².

How do you convert square miles to square kilometers?

Multiply the square mil value by 2.58999. Formula: km² = sq mi × 2.58999.

How many square kilometers are in 5 square miles?

5 sq mi = 12.94995 km².

How do you convert square kilometers back to square miles?

Use the inverse formula: sq mi = km² ÷ 2.58999. For example, 1 km² = 0.386102 sq mi.