Convert Square kilometres to Square miles
1 square kilometre is 0.39 mi². One square kilometre is exactly 0.386102158542 square miles.
One square kilometre is 0.38610216 square miles. To convert square kilometres to square miles, multiply by 0.38610216; to go the other way, divide by 0.38610216 or multiply by 2.5899881. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Office of Weights and Measures. A million square metres, or 100 hectares.
Factor checked against the defining standard · How we check
- Square kilometres × 0.38610216
1 * 0.38610220.386 mi²
1 square kilometre in every area unit
| Unit | Value | Exact factor |
|---|---|---|
| square inches | 1,550,003,100 sq in | × 1,550,003,100.01 |
| square feet | 10,763,910.42 sq ft | × 10,763,910.4167 |
| square yards | 1,195,990.046 sq yd | × 1,195,990.0463 |
| acres | 247.1053815 ac | × 247.105381467 |
| square meters | 1,000,000 m² | × 1,000,000 |
| square millimetres | 1,000,000,000,000 mm² | × 1,000,000,000,000 |
| square centimetres | 10,000,000,000 cm² | × 10,000,000,000 |
| square kilometres (as entered) | 1 km² | — |
| square miles | 0.3861021585 mi² | × 0.386102158542 |
| hectares | 100 ha | × 100 |
Factors are entered by hand from NIST Office of Weights and Measures rather than derived from a units library, so the ones that terminate are exact rather than rounded.
The same converter answers this pair however it is written: sqkm to sqmi is how the symbols are typed on a keyboard with no superscript on it.
How do you convert square kilometres to square miles? The converter and the working
- 1.Take the measurement in square kilometres.
- 2.Multiply by 0.38610216 — that is how many square miles fit in one square kilometre.
- 3.To go back the other way, divide by 0.38610216, or multiply by 2.5899881.
Worked example: 25 square kilometres to square miles
- Formula
- km² × 0.38610216 = mi²
- Arithmetic
- 25 × 0.38610216 = 9.65 mi²
- Answer
- 25 km² = 9.65 mi²
The factor is rounded for display; the figure above is computed from the full value.
Square kilometres to square miles conversion table
| Square kilometres | Square miles |
|---|---|
| 1 km² | 0.39 mi² |
| 2 km² | 0.77 mi² |
| 3 km² | 1.16 mi² |
| 4 km² | 1.54 mi² |
| 5 km² | 1.93 mi² |
| 6 km² | 2.32 mi² |
| 7 km² | 2.7 mi² |
| 8 km² | 3.09 mi² |
| 9 km² | 3.47 mi² |
| 10 km² | 3.86 mi² |
| 12 km² | 4.63 mi² |
| 15 km² | 5.79 mi² |
| 20 km² | 7.72 mi² |
| 25 km² | 9.65 mi² |
| 50 km² | 19.31 mi² |
| 100 km² | 38.61 mi² |
| 200 km² | 77.22 mi² |
| 300 km² | 115.83 mi² |
| 500 km² | 193.05 mi² |
| 1000 km² | 386.1 mi² |
| 2000 km² | 772.2 mi² |
| 5000 km² | 1,930.51 mi² |
| 10000 km² | 3,861.02 mi² |
What is a square kilometre?
A million square metres, or 100 hectares. The unit land area and population density are published in everywhere except the US.
What is a square mile?
Exactly 640 acres — one section of the US Public Land Survey, the grid the Midwest is drawn on. 2.59 square kilometres, and the reason a rural address is often "section 12".
How many square miles are in a square kilometre?
One square kilometre is 0.38610216 square miles. Going the other way, one square mile is 2.5899881 square kilometres. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every area unit here
The whole group — 10 units with their symbols and the size of each one in square meters — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a square kilometre.
Cite this page
- APA
- Rule Calculator. (2026). Convert Square kilometres to square miles. Rule Calculator. https://rulecalculators.com/convert/square-kilometer-to-square-mile
- MLA
- "Convert Square kilometres to square miles." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/square-kilometer-to-square-mile.
- Chicago
- Rule Calculator. "Convert Square kilometres to square miles." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/square-kilometer-to-square-mile.
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Questions people actually ask
- How many square miles are in a square kilometre?
- 0.38610216. Exactly 640 acres — one section of the US Public Land Survey, the grid the Midwest is drawn on. 2.59 square kilometres, and the reason a rural address is often "section 12".
- How do I convert square miles back to square kilometres?
- Divide by 0.38610216, or multiply by 2.5899881 — they are the same operation.
Other area conversions
Square miles to square kilometres — the same conversion the other way.