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Square Miles to Square Kilometers
1 mi² = 2.58998811 km². Convert square miles (mi²) to square kilometers (km²) with the converter, the formula and the tables below.
Convert square miles to square kilometers
1 square mile in other units
How to convert square miles to square kilometers
To convert square miles to square kilometers, multiply the number of square miles by 2.58998811.
km² = mi² × 2.58998811
For example, 5 mi² = 12.94994055 km².
Square miles to square kilometers
| Square miles (mi²) | Square kilometers (km²) |
|---|---|
| 1 mi² | 2.58998811 km² |
| 2 mi² | 5.179976221 km² |
| 3 mi² | 7.769964331 km² |
| 4 mi² | 10.35995244 km² |
| 5 mi² | 12.94994055 km² |
| 10 mi² | 25.8998811 km² |
| 20 mi² | 51.79976221 km² |
| 25 mi² | 64.74970276 km² |
| 50 mi² | 129.4994055 km² |
| 100 mi² | 258.998811 km² |
| 250 mi² | 647.4970276 km² |
| 500 mi² | 1,294.994055 km² |
| 1,000 mi² | 2,589.98811 km² |
Square kilometers to square miles
| Square kilometers (km²) | Square miles (mi²) |
|---|---|
| 1 km² | 0.3861021585 mi² |
| 2 km² | 0.7722043171 mi² |
| 3 km² | 1.158306476 mi² |
| 4 km² | 1.544408634 mi² |
| 5 km² | 1.930510793 mi² |
| 10 km² | 3.861021585 mi² |
| 20 km² | 7.722043171 mi² |
| 25 km² | 9.652553964 mi² |
| 50 km² | 19.30510793 mi² |
| 100 km² | 38.61021585 mi² |
| 250 km² | 96.52553964 mi² |
| 500 km² | 193.0510793 mi² |
| 1,000 km² | 386.1021585 mi² |
Related conversions
Questions
How many square kilometers are in one square mile?
There are 2.58998811 square kilometers in one square mile, and 0.3861021585 square miles in one square kilometer.
How do I convert square miles to square kilometers?
To convert square miles to square kilometers, multiply the number of square miles by 2.58998811. For example, 5 mi² = 12.94994055 km².
What can I type in the conversion box?
A number, a unit and the unit you want, like “5 ft 10 in to cm”, “72 °F in C”, “3 cups to ml” or “60 mph to km/h”. It understands symbols, full names, plurals and British spellings, adds mixed units such as feet and inches together, and accepts fractions like 1 1/2 or ½. Leave out the second unit to see the value in every common unit.
Which units does the converter know?
448 units in 36 categories: everyday measures of length, weight, volume, temperature, area, speed and time, technical ones like pressure, energy, torque, viscosity and radiation, and regional units such as the Japanese tsubo, Chinese jin, Indian tola and Russian verst.
How accurate are the conversions?
They use exact definitions wherever one exists (an inch is exactly 2.54 cm, a pound exactly 0.45359237 kg) and show 10 significant figures. A few units have varied over time or by region; those are marked, and the value in common modern use is the one used.
Are US and UK gallons the same?
No. A US gallon is 3.785 litres and a UK (imperial) gallon is 4.546 litres, and pints, quarts and fluid ounces differ in the same way. Both are listed separately, and the plain names mean the US ones.
Is a kilobyte 1000 or 1024 bytes?
A kilobyte (kB) is 1000 bytes, as with every other metric prefix. 1024 bytes is a kibibyte (KiB), and the same goes for MB and MiB, GB and GiB. Disk makers use the first; many operating systems show the second, which is why a 1 TB drive shows up as about 931 GB.
Why can't I convert cups to grams, or kilograms to litres?
Volume and weight measure different things, so the answer depends on what's being measured: a cup of flour weighs far less than a cup of honey. The converter only converts between units of the same kind, and tells you when two units can't be converted.
Part of Unit Converter
Convert over 400 units of length, weight, temperature, volume, speed, pressure, energy and more. Or just type a conversion like “5 ft 10 in to cm”.
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