Square miles to Square kilometres — mi² to km²

Enter a value to convert square miles (mi²) to square kilometres (km²). Works in your browser with no sign-up.

[ mi² / km² — Area ] instant · works offline
Square miles · mi²
2.589988
Square kilometres · km²
1 mi² = 2.589988 km²
Square miles → Square kilometres
⇄ Reverse: Square kilometres → Square miles
Formula

1 mi² = 2.589988 km²

Multiply the number of square miles by 2.589988. For example, 10 mi² × 2.589988 = 25.89988 km².

Quick Reference — Square miles to Square kilometres
About Area Units

Square metres, hectares and square kilometres are the metric standards. Square feet are common for property in North America and acres for land in the US and UK. One hectare is 10,000 m² (about 2.47 acres) and one acre is exactly 43,560 square feet.

Related Conversions
km² → mi² All area units
All Area Conversions
→Acres to hectares →Hectares to acres →Square feet to square metres →Square kilometres to square miles →Square metres to square feet
FAQ — Square miles to Square kilometres

How do I convert square miles to square kilometres?

Multiply the number of square miles by 2.589988. For example, 10 mi² × 2.589988 = 25.89988 km².

How many square kilometres are in one square mile?

1 square mile = 2.589988 km² (shown to up to 7 significant figures).

How big is a hectare?

A hectare is 10,000 square metres, a square 100 m on each side, which is about 2.47 acres.

Does this converter work offline?

Yes. Once the page has loaded, conversions run entirely in your browser and nothing is sent to a server.