Square Kilometer (km²)
A square kilometer is one million square meters — a convenient scale for towns, lakes, and protected areas.
Square kilometers appear on maps, census data, and environmental reports worldwide.
Square Kilometer to Square Mile
Convert square kilometer to square mile instantly. Type in either field — results update live.
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Area Square Kilometer Square Mile
1 square kilometer = 0.3861021585 square miles
Unit
Unit
Conversion table
Selected km² values converted to mi² using the exact factor from this tool.
| km² | mi² |
|---|---|
| 0.01 | 0.0038610216 |
| 0.1 | 0.0386102159 |
| 1 | 0.3861021585 |
| 2 | 0.7722043171 |
| 3 | 1.1583064756 |
| 5 | 1.9305107927 |
| 10 | 3.8610215854 |
| 20 | 7.7220431708 |
| 50 | 19.3051079271 |
| 100 | 38.6102158542 |
| 1,000 | 386.1021585424 |
How to convert
Exact conversion factors in both directions, plus a worked example.
1 km² = 0.3861021585 mi²
1 mi² = 2.5899881103 km²
To convert square kilometer to square mile, multiply by 0.3861021585.
To convert square mile to square kilometer, multiply by 2.5899881103.
Example: convert 10 km² to mi²
10 × 0.3861021585 = 3.8610215854 mi²
About these units
Short background on the units used in this conversion.
Square Mile (mi²)
A square mile is the area of a square one mile per side, equal to 640 acres or about 2.59 square kilometers.
Square miles describe city limits, national parks, and geographic regions in the US and UK.
Frequently asked questions
How many square miles are in one square kilometer?
One square kilometer equals 0.3861021585 square miles. Multiply your square kilometers value by 0.3861021585 to convert to square miles.
What is the conversion formula?
mi² = km² × 0.3861021585The reverse is
km² = mi² × 2.5899881103, using the same exact factors as this converter.Is this Square Kilometer to Square Mile converter private?
Yes. All calculations run locally in your browser. Nothing you type is sent to a server.
All square kilometer conversions
Jump to any area conversion starting from square kilometer — including the reverse direction and every other unit in our dataset.
square mile (mi²) → square kilometer (km²)
square kilometer (km²) → square meter (m²)square kilometer (km²) → square centimeter (cm²)square kilometer (km²) → square millimeter (mm²)square kilometer (km²) → square micrometer (µm²)square kilometer (km²) → square nanometer (nm²)square kilometer (km²) → square decimeter (dm²)square kilometer (km²) → square dekameter (dam²)square kilometer (km²) → square hectometer (hm²)square kilometer (km²) → hectare (ha)square kilometer (km²) → are (a)square kilometer (km²) → barn (b)square kilometer (km²) → square mile (us survey) (mi² surv)square kilometer (km²) → sectionsquare kilometer (km²) → square yard (yd²)square kilometer (km²) → square foot (ft²)square kilometer (km²) → square foot (us survey) (ft² surv)square kilometer (km²) → sabinsquare kilometer (km²) → square inch (in²)square kilometer (km²) → circular inch (circ in)square kilometer (km²) → acre (ac)square kilometer (km²) → acre (us survey) (ac surv)square kilometer (km²) → square rod (rd²)square kilometer (km²) → square rod (us survey) (rd² surv)square kilometer (km²) → square perch (perch²)square kilometer (km²) → square pole (pole²)square kilometer (km²) → square chain (ch²)square kilometer (km²) → roodsquare kilometer (km²) → township (twp)square kilometer (km²) → homesteadsquare kilometer (km²) → square mil (mil²)square kilometer (km²) → circular mil (circ mil)square kilometer (km²) → square nautical mile (NM²)square kilometer (km²) → arpentsquare kilometer (km²) → cuerdasquare kilometer (km²) → plazasquare kilometer (km²) → varas castellanas cuad (varas cast.)square kilometer (km²) → varas conuqueras cuad (varas con.)square kilometer (km²) → electron cross section (σₑ)