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What is a nautical mile?

The international unit for marine and air navigation — 1 minute of latitude

Definition

The nautical mile equals 1852 meters exactly — defined as one minute of arc along a meridian. It is the standard distance unit for marine and air navigation worldwide. Ship and aircraft speeds are given in knots, where 1 knot = 1 nautical mile per hour.

Common uses

  • Marine navigation and nautical charts
  • Commercial and military aviation distances
  • International maritime law (territorial waters = 12 nmi)

🌍 Real-world scale

Territorial waters extend 12 nautical miles from the coastline. London Heathrow to New York JFK is about 3000 nmi.

Convert from nautical miles

14 conversions
Nautical Mile to Meter1 nmi = 1,852 mNautical Mile to Kilometer1 nmi = 1.852 kmNautical Mile to Centimeter1 nmi = 185,200 cmNautical Mile to Millimeter1 nmi = 1,852,000 mmNautical Mile to Mile1 nmi = 1.15078 miNautical Mile to Yard1 nmi = 2,025.37 ydNautical Mile to Foot1 nmi = 6,076.12 ftNautical Mile to Inch1 nmi = 72,913.39 inNautical Mile to Micrometer1 nmi = 1,852,000,000 µmNautical Mile to Nanometer1 nmi = 1,852,000,000,000 nmNautical Mile to Light Year1 nmi = 1.9576e-13 lyNautical Mile to Furlong1 nmi = 9.20624 furNautical Mile to Fathom1 nmi = 1,012.69 ftmNautical Mile to Angstrom1 nmi = 18,520,000,000,000 Å

Convert to nautical miles

14 conversions
Meter to Nautical Mile1 m = 0.00054 nmiKilometer to Nautical Mile1 km = 0.54 nmiCentimeter to Nautical Mile1 cm = 5.3996e-6 nmiMillimeter to Nautical Mile1 mm = 5.3996e-7 nmiMile to Nautical Mile1 mi = 0.869 nmiYard to Nautical Mile1 yd = 0.0004937 nmiFoot to Nautical Mile1 ft = 0.0001646 nmiInch to Nautical Mile1 in = 1.3715e-5 nmiMicrometer to Nautical Mile1 µm = 5.3996e-10 nmiNanometer to Nautical Mile1 nm = 5.3996e-13 nmiLight Year to Nautical Mile1 ly = 5,108,369,330,453.56 nmiFurlong to Nautical Mile1 fur = 0.1086 nmiFathom to Nautical Mile1 ftm = 0.0009875 nmiAngstrom to Nautical Mile1 Å = 5.3996e-14 nmi

Tips

  • 1 nautical mile = 1.852 km = 1.151 statute miles.
  • A knot (1 nmi/h) equals 1.852 km/h — remember this for weather and sailing reports.
  • Latitude is measured in degrees and minutes; one minute of latitude equals exactly one nautical mile.

Common mistakes

  • Confusing nautical miles with statute miles — the 15% difference matters in flight planning.
  • Reading knots as km/h on weather reports — a 40-knot wind is 74 km/h, not 40.
  • Using nautical miles on land — outside navigation contexts, use kilometres or statute miles.

FAQ about the nautical mile

What is a nautical mile?
The nautical mile equals 1852 meters exactly — defined as one minute of arc along a meridian. It is the standard distance unit for marine and air navigation worldwide. Ship and aircraft speeds are given in knots, where 1 knot = 1 nautical mile per hour.
Where is the nautical mile used?
The nautical mile is commonly used for: Marine navigation and nautical charts; Commercial and military aviation distances; International maritime law (territorial waters = 12 nmi).
What is an example of a nautical mile in real life?
Territorial waters extend 12 nautical miles from the coastline. London Heathrow to New York JFK is about 3000 nmi.
What category does the nautical mile belong to?
The nautical mile is a unit of length, part of the 15-unit length category on UnitConv.
How accurate are nautical mile conversions?
All conversion factors follow NIST and BIPM international standards to 8 significant figures — the highest practical accuracy.
Explore all 15 length units and their conversions.📏 Length hub →