Square kilometers to square miles converter

1 km² = 0.3861022 sq mi. To convert square kilometers to square miles, divide by 2.58998811 (or multiply by ≈ 0.3861022). Example: 10 km² = 3.861022 sq mi.

Result (sq mi)

sq mi = km² ÷ 2.58998811 · Swap: Square miles to square kilometers

Open the full tool: Unit converter →

Square kilometers to square miles chart

Square kilometersSquare miles
1 km²0.386102 sq mi
2 km²0.772204 sq mi
5 km²1.93051 sq mi
10 km²3.86102 sq mi
50 km²19.3051 sq mi
100 km²38.6102 sq mi
500 km²193.051 sq mi
1000 km²386.102 sq mi
10,000 km²3861.02 sq mi
100,000 km²38,610.2 sq mi
1,000,000 km²386,102 sq mi

How to convert square kilometers to square miles

Formula: sq mi = km² ÷ 2.58998811. Worked example: 10 km² = 3.861022 sq mi. Quick estimate: multiply by about 0.4 — the error is 3.6%, fine for everyday use but not for engineering or shopping by exact size.

About these units

A square mile is a square 1,609.344 m on a side, exactly 2.589988110336 km². US sources give the areas of states, countries and cities in square miles.

Category: area. Results on this page are calculated in your browser and rounded to 7 significant digits; the table above uses 6. For other units of area open the full unit converter, or use the reverse page — square miles to square kilometers.

FAQ

How many square miles are in one km²?

1 km² = 0.3861021585 sq mi (rounded). Conversely, 1 sq mi = 2.589988 km².

What is 100 km² in square miles?

100 km² = 38.61022 sq mi.

Is this converter accurate?

Yes — it uses the official definitions (1 km² = 1,000,000 m², 1 sq mi = 2,589,988.11034 m²) and shows results rounded to 7 significant digits.

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