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Square Miles to Square km Converter

Convert square miles to square km and back — exactly 2.589988110336 km² per sq mi. Free, instant, no sign-up, full working shown.

Convert square miles ⇄ square km

25.8999 km²
10 sq mi = 25.8999 km² (1 sq mi = 2.589988110336 km² (exact))

Formula: 10 sq mi × 2.589988110336 = 25.8999 km²

How the square miles to square km converter conversion works

The converter applies km² = sq mi × 2.589988110336. Because area scales with the square of length, the factor is the square of the mile-to-kilometre factor: 1.609344² = 2.589988110336. Going the other way, sq mi = km² ÷ 2.589988110336.

Worked example: Greater London covers about 1,572 km², which is 1,572 ÷ 2.589988110336 = 606.95 sq mi — roughly 607 sq mi.

For smaller areas, use our square feet to square meters converter; for the linear pair behind it, the miles to km converter.

square miles to square km converter questions

How many square km are in a square mile?
Exactly 2.589988110336 km². A mile is 1.609344 km, so a square mile is 1.609344² = 2.589988110336 km² — exact.
How do I convert square miles to square km?
Multiply by 2.589988110336: km² = sq mi × 2.589988110336. So 10 sq mi is 10 × 2.589988110336 = 25.89988110336 km².
How do I convert square km back to square miles?
Divide by 2.589988110336: sq mi = km² ÷ 2.589988110336. So 100 km² is 38.6102 sq mi.
How big is Manhattan in square km?
Manhattan is about 33.6 sq mi, which is 33.6 × 2.589988110336 = 87.02 km².
Is a square mile the same as a mile squared?
A square mile is an area 1 mi by 1 mi. Careful with phrasing: “5 miles square” means 5 mi by 5 mi, which is 25 sq mi, not 5.

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Sources & official guidance

Estimate only — the square mile is 2.589988110336 km² by definition; conversions are exact. See our disclaimer.