Convert Nautical Mile to Kilometre
1 nautical mile = 1.852 kilometre (km). For example, 10 nautical mile = 18.52 kilometre and 100 nautical mile = 185.2 kilometre. Type any value below to convert nautical mile to kilometre both ways — it runs entirely in your browser.
Quick answer: Nautical Mile to Kilometre
1 Nautical Mile = 1.852 Kilometre (nmi → km). To convert nautical mile to kilometre, multiply by 1.852. To convert kilometre to nautical mile, multiply by 0.5399568. The converter at the top does this instantly and both ways; the sections below give the formula, worked examples, a full conversion chart and answers to the most common nautical mile-to-kilometre questions.
How to convert Nautical Mile to Kilometre
To convert nautical mile to kilometre, multiply the number of nautical mile by the conversion factor 1.852, because 1 nmi = 1.852 km. The conversion is linear, so the same factor works for any value — whole numbers, decimals or fractions. For the reverse direction, 1 km = 0.5399568 nmi, so you divide by 1.852 (or multiply by 0.5399568) to turn kilometre back into nautical mile.
km = nmi × 1.852 ·
nmi = km × 0.5399568
- Write down the value you want to convert, in nautical mile.
- Multiply it by 1.852.
- The result is the same area/length/quantity expressed in kilometre.
Nautical Mile to Kilometre — worked examples
Each row shows the exact arithmetic so you can follow the conversion step by step. For example, 5 nautical mile is 9.26 kilometre because 5 nmi × 1.852 = 9.26 km.
| Nautical Mile | Calculation | Kilometre |
|---|---|---|
| 1 nmi | 1 nmi × 1.852 = 1.852 km | 1.852 km |
| 2 nmi | 2 nmi × 1.852 = 3.704 km | 3.704 km |
| 3 nmi | 3 nmi × 1.852 = 5.556 km | 5.556 km |
| 5 nmi | 5 nmi × 1.852 = 9.26 km | 9.26 km |
| 7 nmi | 7 nmi × 1.852 = 12.964 km | 12.964 km |
| 10 nmi | 10 nmi × 1.852 = 18.52 km | 18.52 km |
| 12 nmi | 12 nmi × 1.852 = 22.224 km | 22.224 km |
| 15 nmi | 15 nmi × 1.852 = 27.78 km | 27.78 km |
| 20 nmi | 20 nmi × 1.852 = 37.04 km | 37.04 km |
| 25 nmi | 25 nmi × 1.852 = 46.3 km | 46.3 km |
| 50 nmi | 50 nmi × 1.852 = 92.6 km | 92.6 km |
| 100 nmi | 100 nmi × 1.852 = 185.2 km | 185.2 km |
Common Nautical Mile to Kilometre conversions
These are the nautical mile-to-kilometre values people look up most often. Every figure is computed from the exact factor, so you can rely on them for quick reference:
- 1 nautical mile = 1.852 kilometre
- 2 nautical mile = 3.704 kilometre
- 2.5 nautical mile = 4.63 kilometre
- 3 nautical mile = 5.556 kilometre
- 4 nautical mile = 7.408 kilometre
- 5 nautical mile = 9.26 kilometre
- 6 nautical mile = 11.112 kilometre
- 7 nautical mile = 12.964 kilometre
- 8 nautical mile = 14.816 kilometre
- 9 nautical mile = 16.668 kilometre
- 10 nautical mile = 18.52 kilometre
- 12 nautical mile = 22.224 kilometre
- 15 nautical mile = 27.78 kilometre
- 20 nautical mile = 37.04 kilometre
- 25 nautical mile = 46.3 kilometre
- 30 nautical mile = 55.56 kilometre
- 50 nautical mile = 92.6 kilometre
- 75 nautical mile = 138.9 kilometre
- 100 nautical mile = 185.2 kilometre
- 200 nautical mile = 370.4 kilometre
- 500 nautical mile = 926 kilometre
- 1000 nautical mile = 1,852 kilometre
Nautical Mile to Kilometre conversion chart (both directions)
The chart below converts nautical mile to kilometre and kilometre to nautical mile side by side, so it works whichever way you need. 1 nautical mile = 1.852 kilometre, and 1 kilometre = 0.5399568 nautical mile.
| Nautical Mile → Kilometre | Kilometre → Nautical Mile |
|---|---|
| 0.25 nmi = 0.463 km | 0.25 km = 0.1349892 nmi |
| 0.5 nmi = 0.926 km | 0.5 km = 0.2699784 nmi |
| 1 nmi = 1.852 km | 1 km = 0.5399568 nmi |
| 2 nmi = 3.704 km | 2 km = 1.079914 nmi |
| 3 nmi = 5.556 km | 3 km = 1.61987 nmi |
| 4 nmi = 7.408 km | 4 km = 2.159827 nmi |
| 5 nmi = 9.26 km | 5 km = 2.699784 nmi |
| 6 nmi = 11.112 km | 6 km = 3.239741 nmi |
| 7 nmi = 12.964 km | 7 km = 3.779698 nmi |
| 8 nmi = 14.816 km | 8 km = 4.319654 nmi |
| 9 nmi = 16.668 km | 9 km = 4.859611 nmi |
| 10 nmi = 18.52 km | 10 km = 5.399568 nmi |
| 12 nmi = 22.224 km | 12 km = 6.479482 nmi |
| 15 nmi = 27.78 km | 15 km = 8.099352 nmi |
| 20 nmi = 37.04 km | 20 km = 10.79914 nmi |
| 25 nmi = 46.3 km | 25 km = 13.49892 nmi |
| 30 nmi = 55.56 km | 30 km = 16.1987 nmi |
| 40 nmi = 74.08 km | 40 km = 21.59827 nmi |
| 50 nmi = 92.6 km | 50 km = 26.99784 nmi |
| 75 nmi = 138.9 km | 75 km = 40.49676 nmi |
| 100 nmi = 185.2 km | 100 km = 53.99568 nmi |
| 150 nmi = 277.8 km | 150 km = 80.99352 nmi |
| 200 nmi = 370.4 km | 200 km = 107.9914 nmi |
| 250 nmi = 463 km | 250 km = 134.9892 nmi |
| 500 nmi = 926 km | 500 km = 269.9784 nmi |
| 1000 nmi = 1,852 km | 1000 km = 539.9568 nmi |
Nautical Mile vs Kilometre: which is bigger?
A nautical mile is the larger unit: one nautical mile equals 1.852 kilometres. Put another way, you need 1.852 kilometres to make a single nautical mile.
What is a Nautical Mile? History, origin and usage
The nautical mile arose from navigation: it was defined as the length of one minute of arc of latitude along a meridian, so 60 nautical miles span one degree and Earth's circumference is close to 21,600 of them. Because the Earth is not a perfect sphere this length varied slightly with latitude, so a 1929 international conference in Monaco fixed the international nautical mile at exactly 1,852 metres.
The nautical mile is the standard distance unit in marine and air navigation worldwide. Speed at sea and in the air is measured in knots, one knot being one nautical mile per hour.
Its link to latitude means a navigator can read distance straight off a chart's latitude scale. A minute of latitude is about 1,843 metres at the Equator but roughly 1,862 metres near the poles because of Earth's flattening.
What is a Kilometre? History, origin and usage
The kilometre combines the Greek-derived prefix 'kilo-' (from khilioi, 'thousand') with the metre. It was among the eight original decimal prefixes adopted by the French Academy of Sciences in 1795, soon after the metre itself was defined during the French Revolution.
The kilometre is the standard unit for road, map and geographic distances throughout most of the world. Nearly every country signs its highways and speed limits in kilometres; the main holdouts that still post road distances in miles are the United States and the United Kingdom.
Although the prefix 'kilo-' comes from Greek, the names of the metric submultiples such as deci- and centi- were drawn from Latin instead. The popular running benchmark known as a '5K' is simply a five-kilometre race.
Convert 1 Nautical Mile to other units
It can help to see a nautical mile next to the other units it is commonly compared with. One nautical mile (nmi) is equal to:
| 1 Nautical Mile equals | Unit |
|---|---|
| 1.852 km | Kilometre |
| 1,852 m | Metre |
| 18,520 dm | Decimetre |
| 185,200 cm | Centimetre |
| 1,852,000 mm | Millimetre |
| 1,852,000,000 µm | Micrometre |
| 1.150779 mi | Mile |
| 2,025.372 yd | Yard |
| 6,076.115 ft | Foot |
| 72,913.39 in | Inch |
| 9.206236 fur | Furlong |
| 92.06236 ch | Chain |
| 9,206.236 li | Link |
| 368.2494 rd | Rod |
| 368.2494 pole | Pole |
| 1,012.686 ftm | Fathom |
| 18,228.35 hand | Hand |
| 8,101.487 span | Span |
| 16,202.97 finger | Finger |
| 4,050.744 cubit | Cubit |
| 303.8058 rope | Rope |
| 1,018.6 ken | Ken |
| 0.3835931 lea | League |
| 5,249,764 pt | Point |
| 0.00000001237986 AU | Astronomical Unit |
| 0.0000000000001957566 ly | Light-year |
| 185.2 dam | Decametre |
| 18.52 hm | Hectometre |
| 0.3333333 nl | Nautical League |
Convert 1 Kilometre to other units
One kilometre (km) is equal to:
| 1 Kilometre equals | Unit |
|---|---|
| 1,000 m | Metre |
| 10,000 dm | Decimetre |
| 100,000 cm | Centimetre |
| 1,000,000 mm | Millimetre |
| 1,000,000,000 µm | Micrometre |
| 0.6213712 mi | Mile |
| 1,093.613 yd | Yard |
| 3,280.84 ft | Foot |
| 39,370.08 in | Inch |
| 0.5399568 nmi | Nautical Mile |
| 4.97097 fur | Furlong |
| 49.7097 ch | Chain |
| 4,970.97 li | Link |
| 198.8388 rd | Rod |
| 198.8388 pole | Pole |
| 546.8066 ftm | Fathom |
| 9,842.52 hand | Hand |
| 4,374.453 span | Span |
| 8,748.906 finger | Finger |
| 2,187.227 cubit | Cubit |
| 164.042 rope | Rope |
| 550 ken | Ken |
| 0.2071237 lea | League |
| 2,834,646 pt | Point |
| 0.000000006684587 AU | Astronomical Unit |
| 0.0000000000001057001 ly | Light-year |
| 100 dam | Decametre |
| 10 hm | Hectometre |
| 0.1799856 nl | Nautical League |
Tips for converting Nautical Mile to Kilometre
- To go from nautical mile to kilometre, multiply by 1.852; to go back, divide by 1.852 (or multiply by 0.5399568).
- For a quick mental estimate, remember that 1 nautical mile ≈ 1.852 kilometre, so 10 nautical mile ≈ 18.52 kilometre.
- The converter above keeps full precision; the tables round for readability, so use the tool for exact figures.
- Both fields update live as you type — change either side to convert in that direction.
How to use this Nautical Mile to Kilometre converter
Type a number into the Nautical Mile field and the equivalent in Kilometre appears instantly — there is no “convert” button to press and nothing is sent to a server, so it works offline once the page has loaded and is safe for any data. You can also type into the Kilometre field to convert the other way (kilometre to nautical mile). Use the swap control to flip the two units, and copy the result with a single click. Because the calculation runs in your browser with full floating-point precision, the converter is more exact than the rounded figures shown in the reference chart above — use the chart for quick look-ups and the tool for precise work.
Accuracy and method
Every figure on this page — the formula, the worked examples, the conversion chart and the “convert to other units” tables — is computed from a single verified conversion factor (1 nmi = 1.852 km), never copied from a hand-typed lookup table that could drift. That factor is derived from each unit’s definition in terms of a common base unit, and an automated check re-verifies all of the site’s factors on every update, so the numbers here stay correct over time. This matters for nautical mile-to-kilometre conversions because a small rounding error in a published table compounds quickly at larger quantities; computing from the exact factor avoids that.
Sources
- NIST Special Publication 811 — Guide for the Use of the SI — publishes the exact metric equivalents of the customary units. The inch, foot, yard and mile are defined exactly in metres by the 1959 international yard-and-pound agreement, so every imperial figure on this page is exact, not rounded.
- BIPM — The International System of Units (SI Brochure) — the defining document for the SI, published by the International Bureau of Weights and Measures. It fixes the base unit that this conversion resolves to, which is why the factor here can be exact rather than approximate.
The metric units (km, m, cm, mm, µm) are exact by definition, and the imperial units (mile, yard, foot, inch, nautical mile) use their exact international values. Traditional units (hand, span, finger, cubit, rod/pole, link, rope, ken, league) are given at their commonly accepted standard sizes — historical local values sometimes differed, so confirm against a primary source before relying on them for legal or historical work.
Frequently asked questions
- How many kilometre are in 1 nautical mile?
- 1 nautical mile = 1.852 kilometre (km). To convert any number of nautical mile to kilometre, multiply by 1.852.
- How do I convert nautical mile to kilometre?
- Multiply the number of nautical mile by 1.852. For example, 10 nautical mile = 10 × 1.852 = 18.52 kilometre, and 25 nautical mile = 46.3 kilometre.
- How many nautical mile are in 1 kilometre?
- 1 kilometre = 0.5399568 nautical mile. So to convert kilometre back to nautical mile, multiply by 0.5399568.
- What is the formula to convert nautical mile to kilometre?
- kilometre = nautical mile × 1.852. The reverse formula is nautical mile = kilometre × 0.5399568.
- How much is 100 nautical mile in kilometre?
- 100 nautical mile = 185.2 kilometre. (And 1000 nautical mile = 1,852 kilometre.)
- Which is bigger, a nautical mile or a kilometre?
- A nautical mile is larger: 1 nautical mile = 1.852 kilometre.
- Is this nautical mile to kilometre converter accurate?
- Yes — every value is computed from the exact 1.852 km per nmi factor (not rounded look-up tables), and the factors are re-verified automatically on every update.
- Can I convert kilometre to nautical mile too?
- Yes. The converter works both ways — enter a value in either field. 1 kilometre = 0.5399568 nautical mile.