km² × 0.386102158542 = mi²
One square kilometer equals 0.386102158542 square miles.Conversion lab / area
Square Kilometers to Square Miles Converter
Convert square kilometers to square miles with a precise area factor.
Square Kilometers to Square Miles Converter: 1 square kilometer = 0.38610216 square miles. To convert any amount, multiply the number of square kilometers by 0.38610216. TOEA calculates with the full stored factor (km² × 0.3861021585424459 = mi²) and keeps the calculation in your browser. Runs 100% locally in your browser with zero server file uploads.
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Result / live
0.38610216
mi²square miles
1 km²0.38610216 mi²
2 km²0.77220432 mi²
5 km²1.93051079 mi²
10 km²3.86102159 mi²
100 km²38.61021585 mi²
Square kilometers to square miles conversion table
| square kilometers (km²) | square miles (mi²) |
|---|---|
| 1 km² | 0.3861022 mi² |
| 2 km² | 0.7722043 mi² |
| 3 km² | 1.158306 mi² |
| 4 km² | 1.544409 mi² |
| 5 km² | 1.930511 mi² |
| 6 km² | 2.316613 mi² |
| 7 km² | 2.702715 mi² |
| 8 km² | 3.088817 mi² |
| 9 km² | 3.474919 mi² |
| 10 km² | 3.861022 mi² |
| 15 km² | 5.791532 mi² |
| square kilometers (km²) | square miles (mi²) |
|---|---|
| 20 km² | 7.722043 mi² |
| 25 km² | 9.652554 mi² |
| 30 km² | 11.58306 mi² |
| 40 km² | 15.44409 mi² |
| 50 km² | 19.30511 mi² |
| 75 km² | 28.95766 mi² |
| 100 km² | 38.61022 mi² |
| 250 km² | 96.52554 mi² |
| 500 km² | 193.0511 mi² |
| 1,000 km² | 386.1022 mi² |
Rounded to seven significant digits; the converter above uses the full factor.
Worked examples
Multiply the number of square kilometers by 0.3861021585:
2 km² × 0.3861021585 = 0.7722043 mi²5 km² × 0.3861021585 = 1.930511 mi²10 km² × 0.3861021585 = 3.861022 mi²
How to use it
- Enter the number of square kilometers you want to convert.
- Read the square miles result as it updates.
- Copy the result or open the reverse conversion.
Privacy & limitations
Your value never leaves this browser. JavaScript floating-point arithmetic can round the last displayed digit for very large or highly precise values; do not use this general utility where regulated measurement traceability is required.
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Frequently asked questions
What formula converts square kilometers to square miles?
km² × 0.3861021585424459 = mi². The result is displayed with up to 8 decimal places without changing the underlying calculation.
How many square miles is 100 km²?
100 km² = 38.61022 mi². Multiply 100 by 0.38610216 to get it, or find it in the conversion table.
How do I convert square miles back to square kilometers?
Divide by 0.38610216, or open the reverse converter, which uses the exact reciprocal of the same factor.
Can I enter zero, decimals, or negative values?
Yes. The engine handles finite positive, zero, decimal, and negative numbers. Whether a negative measurement is meaningful depends on your use case.
Is this conversion performed online?
The page is online, but the number you type is converted locally in your browser and is not sent to TOEA.
Embed this tool
Free to use on any website. Paste the code where the tool should appear; the link under it lets readers open the full page.
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