📏 Square kilometers to Square miles Converter
Convert square kilometers (km²) to square miles (mi²) instantly, with the formula, a worked example and a conversion table.
Quick answer: 1 square kilometer (km²) = 0.38610216 square miles (mi²). Formula: mi² = km² × 0.38610216.
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Square kilometers to Square miles Converter inputs
Result
Square kilometers to Square miles conversion table
| Square kilometers (km²) | Square miles (mi²) |
|---|---|
| 0.1 km² | 0.038610216 mi² |
| 0.5 km² | 0.19305108 mi² |
| 1 km² | 0.38610216 mi² |
| 2 km² | 0.77220432 mi² |
| 3 km² | 1.1583065 mi² |
| 5 km² | 1.9305108 mi² |
| 10 km² | 3.8610216 mi² |
| 20 km² | 7.7220432 mi² |
| 25 km² | 9.652554 mi² |
| 50 km² | 19.305108 mi² |
| 100 km² | 38.610216 mi² |
| 1,000 km² | 386.10216 mi² |
Other area conversions
How to convert square kilometers to square miles
Multiply the number of square kilometers by 0.38610216 to get square miles: mi² = km² × 0.38610216.
Example: 5 km² = 1.9305108 mi².
The square kilometer (km²) and the square mile (mi²) are both units of area. Need the opposite direction? Use the mi² to km² converter.
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Metric and imperial units
The metric system (SI) is used by almost every country and by science worldwide. Its units scale by powers of ten – 1 kilometer is 1,000 meters, 1 meter is 100 centimeters – which makes conversions inside the system easy. The imperial and US customary systems (inches, feet, pounds, gallons) are still used daily in the United States and partly in the UK.
Since 1959 the inch has been defined as exactly 2.54 centimeters and the pound as exactly 0.45359237 kilograms, so conversions between the two systems are exact. Note that a US gallon (3.785 L) and an imperial gallon (4.546 L) are different – choose the right one above.
This converter covers 10 categories and 66 units: length, weight, temperature, volume, area, speed, time, data, energy, pressure.
Frequently asked questions
How many square miles are in a square kilometer?
1 square kilometer = 0.38610216 square miles.
How do I convert square kilometers to square miles?
Use the formula mi² = km² × 0.38610216. For example, 5 km² = 1.9305108 mi².
How do I convert square miles back to square kilometers?
1 square mile = 2.5899881 square kilometers. Use the mi² to km² converter linked on this page.
Are these conversions exact?
Yes – all factors use the internationally defined values (for example 1 inch = 2.54 cm exactly, 1 pound = 0.45359237 kg exactly). Results are rounded to 8 significant digits for display.