km² to mi² Converter

How km² to mi² works

Convert square kilometres to square miles instantly. 1 km² = 0.3861022 mi², with a live result and a quick reference table. Everything happens inside this page: the tool reads your input, runs the calculation or conversion locally, and hands the result back to you. Nothing is transmitted, because there is no backend to transmit it to.

That design choice is deliberate. Most free tool sites upload your files to a server, process them there, and quietly keep a copy. Toolcin cannot do that — the site is a set of static files. If your connection dropped the moment the page finished loading, every tool would still work.

What one km² is in mi²

The conversion is a single multiplication by 0.386102159, so the result is only as rounded as the display. Going the other way divides by the same figure: one mi² is 2.589988107 km².

No intermediate rounding happens. A value entered with four decimals comes back with the same precision, which is what makes the factor trustworthy for anything that accumulates error.

Values people ask for

Where this pair comes up

Country areas and large land parcels are quoted in square kilometres or square miles.

One square mile is 2.59 km², so 100 km² is 38.6 mi².

Good to know

• Works offline once loaded, including on flights and in locked-down networks.
• No file size limit beyond your device's own memory.
• Free to use, with no account and no usage counter.
• Results are produced locally, so they are not logged or shared with anyone.

Questions