Nautical miles to Kilometers Converter
1 nautical mile (nmi) equals 1.852 kilometers (km).
Quick answer
One nautical mile is exactly 1.852 km . Multiply nautical miles by 1.852.
1 nautical mile = 1.852 kilometers 1 kilometer = 0.5399568035 nautical miles
Formula: km = nmi × 1.852
Quick estimate: double and take off 7%: 100 nmi ≈ 200 − 15 = 185 km.
From
Inch (in) Meter (m) Centimeter (cm) Foot (ft) Kilometer (km) Mile (mi) Millimeter (mm) Yard (yd) Micrometer (µm) Nanometer (nm) Nautical mile (nmi) Light-year (ly) Astronomical unit (au) ångström (Å) Parsec (pc) Decimeter (dm) Fathom (ftm) Furlong (fur) Picometer (pm) Hand (hh) Thou (th) Chain (ch) Kiloparsec (kpc) League (lea) Megaparsec (Mpc) Rod (rd) American football field Chinese li (里) Planck length (ℓP) US survey foot (ftUS) Cable Femtometer (fm) Bohr radius (a₀) Earth radius (R⊕) Cubit Decameter (dam) Gaj Hectometer (hm) Light-second (ls) Castilian vara Roman mile Swedish mil Barleycorn Chi (尺) Cun (寸) Light-minute Link (li) Lunar distance (LD) Marathon Royal cubit Shaku (尺) Smoot Solar radius (R☉) Span Stadion Versta Biblical cubit Roman foot US survey mile Arshin Gigameter (Gm) Gigaparsec (Gpc) Light-day Light-hour Line Megameter (Mm) Admiralty mile Earth circumference Eiffel Tower height Greek foot Japanese ri (里) Jupiter radius (RJ) Olympic pool length Roman pace Spanish league Texas vara Banana Beard-second Double-decker bus Ell Ken (間) Kos Lieue Ligne Nautical league Palm Parasang Pied du roi Pulgada Sazhen Soccer pitch length Sun (寸) Toise Wa Yojana Mount Everest height Ramsden's chain US survey inch Blue whale length Credit card length Finger Human hair width Light-week Millimicron (mµ) Nail Shackle Shaftment Burj Khalifa height Castilian foot Earth diameter Egyptian common cubit Egyptian digit Egyptian palm Empire State Building height Gallic league Greek cubit Greek finger Hubble length Irish mile Korean ri (리) Mexican vara Prussian mile Roman cubit Roman digit Roman inch Roman palm Roman stadium Roman step Russian mile Scottish mile Statue of Liberty height X unit (xu) Angul Attoparsec (apc) Braca Classical electron radius (rₑ) Electron Compton wavelength (λC) Farsakh Handbreadth Hasta Human height Legua Pouce Vershok Zhang (丈) Biblical finger Biblical parasang Biblical span Chinese bu (步) Chinese fen (分) Chinese li (small) (厘) Danish mile French point Greek palm Greek span Japanese bu (分) Korean chi (치) Portuguese foot Portuguese vara Prussian ell Prussian foot Prussian inch Prussian rod Rhineland rod Russian foot Sabbath day's journey Swiss hour Talmudic mil Aln Arsin Aune Barid Bema Beru Cho (町) Danda Day's journey Dhira Diaulos Dichas Duim Dyuym Famn Giraffe height Grain of rice Hippikon Iteru Ja (자) Jo (丈) Khet Khuep Kondylos Kujirajaku Kush Liniya Nindan Nio Orgyia Palmo Paperclip length Pencil length Plethron Polegada Pyad Pygme Qasaba Reed Remen Sen Sheppey Shu-si Siriometer Smartphone length Sok Ush Yin (引) Yot Japanese rin (厘) Korean bun (푼) Spanish pace Welsh mile Fjardingsvag Hao (毫) Hu (忽) Kraphiat Linea Linha Mo (毛) Punto Si (丝) Tochka
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Inch (in) Meter (m) Centimeter (cm) Foot (ft) Kilometer (km) Mile (mi) Millimeter (mm) Yard (yd) Micrometer (µm) Nanometer (nm) Nautical mile (nmi) Light-year (ly) Astronomical unit (au) ångström (Å) Parsec (pc) Decimeter (dm) Fathom (ftm) Furlong (fur) Picometer (pm) Hand (hh) Thou (th) Chain (ch) Kiloparsec (kpc) League (lea) Megaparsec (Mpc) Rod (rd) American football field Chinese li (里) Planck length (ℓP) US survey foot (ftUS) Cable Femtometer (fm) Bohr radius (a₀) Earth radius (R⊕) Cubit Decameter (dam) Gaj Hectometer (hm) Light-second (ls) Castilian vara Roman mile Swedish mil Barleycorn Chi (尺) Cun (寸) Light-minute Link (li) Lunar distance (LD) Marathon Royal cubit Shaku (尺) Smoot Solar radius (R☉) Span Stadion Versta Biblical cubit Roman foot US survey mile Arshin Gigameter (Gm) Gigaparsec (Gpc) Light-day Light-hour Line Megameter (Mm) Admiralty mile Earth circumference Eiffel Tower height Greek foot Japanese ri (里) Jupiter radius (RJ) Olympic pool length Roman pace Spanish league Texas vara Banana Beard-second Double-decker bus Ell Ken (間) Kos Lieue Ligne Nautical league Palm Parasang Pied du roi Pulgada Sazhen Soccer pitch length Sun (寸) Toise Wa Yojana Mount Everest height Ramsden's chain US survey inch Blue whale length Credit card length Finger Human hair width Light-week Millimicron (mµ) Nail Shackle Shaftment Burj Khalifa height Castilian foot Earth diameter Egyptian common cubit Egyptian digit Egyptian palm Empire State Building height Gallic league Greek cubit Greek finger Hubble length Irish mile Korean ri (리) Mexican vara Prussian mile Roman cubit Roman digit Roman inch Roman palm Roman stadium Roman step Russian mile Scottish mile Statue of Liberty height X unit (xu) Angul Attoparsec (apc) Braca Classical electron radius (rₑ) Electron Compton wavelength (λC) Farsakh Handbreadth Hasta Human height Legua Pouce Vershok Zhang (丈) Biblical finger Biblical parasang Biblical span Chinese bu (步) Chinese fen (分) Chinese li (small) (厘) Danish mile French point Greek palm Greek span Japanese bu (分) Korean chi (치) Portuguese foot Portuguese vara Prussian ell Prussian foot Prussian inch Prussian rod Rhineland rod Russian foot Sabbath day's journey Swiss hour Talmudic mil Aln Arsin Aune Barid Bema Beru Cho (町) Danda Day's journey Dhira Diaulos Dichas Duim Dyuym Famn Giraffe height Grain of rice Hippikon Iteru Ja (자) Jo (丈) Khet Khuep Kondylos Kujirajaku Kush Liniya Nindan Nio Orgyia Palmo Paperclip length Pencil length Plethron Polegada Pyad Pygme Qasaba Reed Remen Sen Sheppey Shu-si Siriometer Smartphone length Sok Ush Yin (引) Yot Japanese rin (厘) Korean bun (푼) Spanish pace Welsh mile Fjardingsvag Hao (毫) Hu (忽) Kraphiat Linea Linha Mo (毛) Punto Si (丝) Tochka
1 nautical mile = 1.852 kilometers
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How to convert nautical miles to kilometers
km = nmi × 1.852
To convert nautical miles to kilometers, multiply the number of nautical miles by 1.852.
Example: 18 nmi to km
Start with the value in nautical miles: 18 nmi.
Multiply by 1.852: 18 × 1.852 = 33.336.
Result: 18 nautical miles = 33.336 kilometers .
Going the other way, 1 kilometer = 0.539956803456 nautical miles, so to convert kilometers back to nautical miles you divide by the same number. See kilometers to nautical miles .
Where the conversion factor comes from
The nautical mile was originally one minute of latitude. It was fixed internationally at exactly 1,852 m in 1929. Because it matches the Earth's geometry, charts, aviation and shipping use it along with knots (nautical miles per hour).
Mental math: nmi to km in your head
Double it and subtract about 7%.
When you need to convert nautical miles to kilometers
Sea and air navigation distances. Territorial waters (12 nmi) and exclusive economic zones (200 nmi).
Common mistakes
Using the statute mile (1.609 km) for nautical distances.
Everyday nautical miles in kilometers
Example Nautical miles Kilometers
Territorial sea limit 12 nmi 22.224 km Exclusive economic zone 200 nmi 370.4 km Atlantic crossing (NY–Southampton, about) 3,100 nmi 5,741.2 km
Nautical miles to kilometers conversion table
More nmi to km values
What is a nautical mile?
The nautical mile is a unit of distance used at sea and in the air, equal to exactly 1,852 meters, or about 1.151 statute miles.
More about nautical miles →
What is a kilometer?
The kilometer (also spelled kilometre) is a metric unit of length equal to 1,000 meters.
More about kilometers →
Convert nautical miles to other units
Convert other units to kilometers
Frequently asked questions
How many kilometers are in a nautical mile? One nautical mile is 1.852 kilometers.
How many nautical miles are in a kilometer? One kilometer is 0.5399568035 nautical miles.
What is the formula to convert nautical miles to kilometers? km = nmi × 1.852.
How many km in a nautical mile? Exactly 1.852 km.
Why is a nautical mile longer than a mile? It is based on one minute of latitude (1/60 of a degree), which is about 1,852 m, rather than on 5,280 feet.