Square kilometres to Square miles — km² to mi²

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

[ km² / mi² — Area ] instant · works offline
Square kilometres · km²
0.3861022
Square miles · mi²
1 km² = 0.3861022 mi²
Square kilometres → Square miles
⇄ Reverse: Square miles → Square kilometres
Formula

1 km² = 0.3861022 mi²

Multiply the number of square kilometres by 0.3861022 (or divide by 2.589988). For example, 10 km² × 0.3861022 = 3.861022 mi².

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

How do I convert square kilometres to square miles?

Multiply the number of square kilometres by 0.3861022 (or divide by 2.589988). For example, 10 km² × 0.3861022 = 3.861022 mi².

How many square miles are in one square kilometre?

1 square kilometre = 0.3861022 mi² (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.