km to Nautical Miles Converter

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Convert kilometers to nautical miles using the inverse of the exact factor 1 nmi = 1,852 m, which gives 1 km ≈ 0.5400 nmi. Useful for converting Coast Guard search-and-rescue radii, shipping route distances and aviation NDB ranges from metric news reports back into the unit pilots and mariners actually use day to day. Browser-local.

Kilometer (km)
Nautical mile (nmi)

Kilometer (km) → Nautical mile (nmi)

Quick reference table

Kilometer (km)Nautical mile (nmi)
1 km0.54 nautical mi
2 km1.0799 nautical mi
5 km2.6998 nautical mi
10 km5.3996 nautical mi
25 km13.4989 nautical mi
50 km26.9978 nautical mi
100 km53.9957 nautical mi

Glossary

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.

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).

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

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