Square miles to square kilometers converter

1 sq mi = 2.589988 km². To convert square miles to square kilometers, divide by 0.386102159 (or multiply by ≈ 2.589988). Example: 10 sq mi = 25.89988 km².

Result (km²)

km² = sq mi ÷ 0.386102159 · Swap: Square kilometers to square miles

Open the full tool: Unit converter →

Square miles to square kilometers chart

Square milesSquare kilometers
1 sq mi2.58999 km²
2 sq mi5.17998 km²
3 sq mi7.76996 km²
4 sq mi10.36 km²
5 sq mi12.9499 km²
6 sq mi15.5399 km²
7 sq mi18.1299 km²
8 sq mi20.7199 km²
9 sq mi23.3099 km²
10 sq mi25.8999 km²
12 sq mi31.0799 km²
15 sq mi38.8498 km²
20 sq mi51.7998 km²
25 sq mi64.7497 km²
30 sq mi77.6996 km²
40 sq mi103.6 km²
50 sq mi129.499 km²
60 sq mi155.399 km²
75 sq mi194.249 km²
100 sq mi258.999 km²
200 sq mi517.998 km²
500 sq mi1294.99 km²
1000 sq mi2589.99 km²

How to convert square miles to square kilometers

Formula: km² = sq mi ÷ 0.386102159. Worked example: 10 sq mi = 25.89988 km². Quick estimate: multiply by about 2.6 — the error is 0.39%, 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 kilometers to square miles.

FAQ

How many square kilometers are in one sq mi?

1 sq mi = 2.58998811 km² (rounded). Conversely, 1 km² = 0.3861022 sq mi.

What is 100 sq mi in square kilometers?

100 sq mi = 258.9988 km².

Is this converter accurate?

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

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