Nautical Mile to Kilometer Converter

The nautical mile is defined as exactly 1,852 meters, originally one minute of latitude along a meridian. Marine and air navigation use it because it maps directly onto chart coordinates. The kilometer is 1,000 meters, the standard unit for road distances, maps, and geography in most of the world. Road signs, running races, and vehicle odometers outside the US and UK all use it. One Nautical Mile equals 1.852 Kilometer (1 nmi = 1.852 km). Nautical Mile to Kilometer conversion comes up most often in marine navigation and charts and in aviation flight planning, typically when figures need restating for road distances and signage outside the US.

Precision and Rounding: Length factors between metric and imperial units are exact by definition (1 ft = 0.3048 m since 1959), so any rounding error comes from display precision, not the factor. Two or three decimal places suit carpentry and DIY work; machining and surveying often require four or more.

Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).