Nautical Miles to km Converter

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Convert nautical miles to kilometers using the international rate 1 nautical mile = 1,852 m exactly, set by BIPM and the IHO. The nautical mile equals one minute of arc along a meridian and is the standard unit for marine navigation, aviation flight planning and maritime law. Browser-local conversion, useful for sailors, pilots and anyone reading flight plans or shipping notices.

Nautical mile (nmi)
Kilometer (km)

Nautical mile (nmi) → Kilometer (km)

Quick reference table

Nautical mile (nmi)Kilometer (km)
1 nautical mi1.852 km
2 nautical mi3.704 km
5 nautical mi9.26 km
10 nautical mi18.52 km
25 nautical mi46.3 km
50 nautical mi92.6 km
100 nautical mi185.2 km

Glossary

Nautical mile (nmi)

A nautical mile is exactly 1,852 m and equals one minute of arc along a meridian, which makes it the natural unit for marine and aviation navigation. One knot is one nautical mile per hour. A nautical mile is about 15% longer than a statute mile (1 nmi = 1.1508 mi).

Kilometer (km)

A kilometer is one thousand meters (1 km = 0.6214 mile = 0.5400 nautical mile). It is the standard road-distance unit everywhere except the United States, the United Kingdom and a handful of other countries. Marathon distances, highway speeds and geographic distances on most maps use kilometers.

Metric system (SI)

The metric system is a decimal system of measurement built around the meter for length, the kilogram for mass and the second for time, with multiples and submultiples expressed as powers of ten (millimeter, centimeter, kilometer). Adopted in France in 1799 and codified internationally as the International System of Units (SI) in 1960, it is now the official measurement system in nearly every country and the standard in science and engineering worldwide.

Imperial / US Customary system

The imperial system is the historical English system of weights and measures whose length units are the inch, foot, yard and mile (12 in = 1 ft, 3 ft = 1 yd, 1,760 yd = 1 mi). Codified by the British Weights and Measures Act of 1824 and aligned with US Customary by the international yard-and-pound agreement of 1959 (1 inch = 25.4 mm exactly), it is still used in the United States, the United Kingdom and a handful of other countries for everyday distances.

Related tools

Kilometers to Nautical Miles
Convert km to nautical miles — 1 km = 0.5400 nmi (1 nmi = 1.852 km)
Miles to Kilometers
Convert miles to kilometers — exact factor 1 mi = 1.609344 km
Kilometers to Miles
Convert kilometers to miles — 1 km = 0.6214 mi (1 mi = 1.6093 km)
Length Converter
Convert length units between metric and imperial — mm, cm, m, km, inches, feet, yards, miles