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Square Miles to Square Kilometers Converter (mi² to km²)

1 mi² = 2.58998811 km². Type any value to convert square miles to square kilometers.

1 mi² = 2.58998811 km²

Formula: km² = mi² × 2.58998811

Common values
Decimals
In every unit 12 units
Square millimeter (mm²) 2,589,988,110,000 mm²
Square centimeter (cm²) 25,899,881,100 cm²
Square meter (m²) 2,589,988.11 m²
Are (a) 25,899.8811 a
Dunam (dunam) 2,589.98811 dunam
Hectare (ha) 258.998811 ha
Square kilometer (km²) 2.58998811 km²
Square inch (in²) 4,014,489,600 in²
Square foot (ft²) 27,878,400 ft²
Square yard (yd²) 3,097,600 yd²
Acre (ac) 640 ac
Square mile (mi²) 1 mi²

Convert on our server?

If you continue, the file is uploaded over an encrypted connection and converted on our server. You can keep using the site meanwhile. The original is deleted as soon as it is converted; the result is kept for 6 hours so you can download it, and you can delete it at any time. Files are never shared or used for anything else.

Calculated in your browser – nothing you type is sent anywhere. Privacy details

Square miles to square kilometers table

Formula: km² = mi² × 2.58998811

Square mile (mi²)Square kilometer (km²)
0.1 mi²0.258998811 km²
0.25 mi²0.6474970276 km²
0.5 mi²1.294994055 km²
1 mi²2.58998811 km²
2 mi²5.179976221 km²
3 mi²7.769964331 km²
4 mi²10.35995244 km²
5 mi²12.94994055 km²
6 mi²15.53992866 km²
7 mi²18.12991677 km²
8 mi²20.71990488 km²
9 mi²23.30989299 km²
10 mi²25.8998811 km²
12 mi²31.07985732 km²
15 mi²38.84982166 km²
20 mi²51.79976221 km²
25 mi²64.74970276 km²
30 mi²77.69964331 km²
40 mi²103.5995244 km²
50 mi²129.4994055 km²
60 mi²155.3992866 km²
75 mi²194.2491083 km²
100 mi²258.998811 km²
150 mi²388.4982166 km²
200 mi²517.9976221 km²
250 mi²647.4970276 km²
500 mi²1,294.994055 km²
1,000 mi²2,589.98811 km²

How to use: Square Miles to Square Kilometers

  1. 1 Type the value in square miles.
  2. 2 The result in square kilometers appears at once – or type in the square kilometers field to convert back.
  3. 3 Pick a common value, round to fewer decimals or swap the units with one click.
  4. 4 Copy the result, or open “In every unit” to see the value in all units of area.

About this tool

Square mile (mi²) is a unit of area (imperial and US customary); 1 mi² = 2,589,988.11 m². Square kilometer (km²) is a unit of area (SI); 1 km² = 1,000,000 m².

To convert square miles to square kilometers, multiply the value by 2.58998811 (km² = mi² × 2.58998811). Example: 50 mi² = 129.4994055 km².

Calculated in your browser – nothing you type is sent anywhere.

Frequently asked questions

How do I convert square miles to square kilometers?

To convert square miles to square kilometers, multiply the value by 2.58998811: km² = mi² × 2.58998811. For example 50 mi² = 129.4994055 km².

What is 1 mi² in square kilometers?

1 mi² = 2.58998811 km². The other way round, 1 km² = 0.3861021585 mi².

How exact is the result?

The converter uses the official definitions of both units and shows up to 10 significant digits; choose 0–6 decimals to round. Both units are defined exactly in terms of each other, so the factor itself is exact.

Can I convert other units of area here?

Yes – choose any of the 12 units of area in the From and To lists, or switch to another measurement at the top.

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