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Convert square kilometers to square miles
Instant, accurate km² → mi² conversion with a live converter, table and formula.
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1 square kilometer = 0.386102 square miles
1 square mile = 2.58999 square kilometers
square kilometers to square miles table
| square kilometers (km²) | square miles (mi²) |
|---|---|
| 0.5 | 0.193051 |
| 1 | 0.386102 |
| 2 | 0.772204 |
| 5 | 1.93051 |
| 10 | 3.86102 |
| 20 | 7.72204 |
| 50 | 19.3051 |
| 100 | 38.6102 |
| 500 | 193.051 |
| 1000 | 386.102 |
Formula
square miles = square kilometers × 0.386102.
Example
10 square kilometers = 3.86102 square miles.
What is a square kilometer?
A square kilometer (km²) is 1,000,000 m² (about 247 acres).
What is a square mile?
A square mile (mi²) is 640 acres (2.59 km²).
Real-world reference points
A parking space is ~12 m²; a tennis court ~261 m²; a football pitch ~7,100 m² (about 1.8 acres).
| Reference | square kilometers | square miles |
|---|---|---|
| Parking space | 0.000013 km² | 0.000005 mi² |
| One-bedroom flat | 0.00005 km² | 0.000019 mi² |
| Tennis court | 0.000261 km² | 0.000101 mi² |
| Football (soccer) pitch | 0.00714 km² | 0.00276 mi² |
| City block (typical) | 0.02 km² | 0.00772 mi² |
Mistakes to avoid with area conversions
- Confusing '10 square feet' with 'a 10-foot square' — the square is 100 ft², ten times bigger.
- Swapping acres and hectares: a hectare is ~2.47 acres, enough to wreck a land deal.
- Quoting apartment size in built-up vs carpet area without saying which — they differ 15-30%.
Frequently asked questions
How many square miles in a square kilometers?+
1 square kilometer = 0.386102 square miles.
How do I convert square kilometers to square miles?+
Enter the value in the square kilometers box above and the square miles value appears instantly. You can also type in the square miles box to convert the other way.
Is this km² to mi² converter free?+
Yes — it is 100% free, needs no sign-up, and runs entirely in your browser.