Kilometer to Nautical Mile Converter
Length · unit-converter
Convert Kilometer to Nautical Mile with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use SI-based definitions (international yard, nautical mile, etc.).
Calculator
From: Kilometer (km)
To: Nautical Mile (nmi)
About Kilometer
The kilometer is an SI unit equal to 1,000 meters. It is the standard unit for longer distances in most countries that use the metric system.
About Nautical Mile
The nautical mile is a non-SI unit of length used in air and sea navigation. It is defined as exactly 1,852 meters (about 1.15078 statute miles).
How to convert kilometers to nautical miles
1 kilometer is equal to 0.53995680345572 nautical mile:
1 km = (1000 m ÷ 1852 m) nmi = 0.53995680345572 nmi
Each kilometer is defined as 1000 m and each nautical mile as 1852 m, so one km equals 1000 ÷ 1852 nmi = 0.53995680345572 nmi.
Let d(km) be the numeric value of the same length measured in Kilometer (km), and d(nmi) the value in Nautical Mile (nmi). Then:
d(nmi) = d(km) × (1000 / 1852)
Equivalently, divide by how many km fit into one nmi (meters per nmi divided by meters per km):
d(nmi) = d(km) ÷ 1.852
Or: nautical mile = kilometer ÷ 1.852
Examples
Example #1: Convert 20 km to nautical mile
20 km = 20 km × (1000/1852) nmi = 10.7991360691 nmi
20 km = 20 km ÷ 1.852 = 10.7991360691 nmi
Example #2: Convert 50 km to nautical mile
50 km = 50 km × (1000/1852) nmi = 26.9978401728 nmi
50 km = 50 km ÷ 1.852 = 26.9978401728 nmi
Summary
To convert Kilometer to Nautical Mile, multiply the value in km by the ratio of meters per km divided by meters per nmi. Equivalently: value_nmi = value_km × (1000 / 1852). Numerically, 1 km equals 0.5399568034557235 nmi.
Relationship context
You are converting between metric (SI) (Kilometers) and nautical (navigation) (Nautical Miles). Metric units are decimal; imperial units use inches, feet, yards, and miles tied to the international yard definition. Nautical miles are defined in meters (1 nmi = 1,852 m). This tool uses SI-based factors so results stay consistent with modern standards.
Conversion tables
| Kilometer (km) | Nautical Mile (nmi) |
|---|---|
| 0.1 | 0.0539956803 |
| 1 | 0.5399568035 |
| 2 | 1.0799136069 |
| 3 | 1.6198704104 |
| 4 | 2.1598272138 |
| 5 | 2.6997840173 |
| 6 | 3.2397408207 |
| 7 | 3.7796976242 |
| 8 | 4.3196544276 |
| 9 | 4.8596112311 |
| Kilometer (km) | Nautical Mile (nmi) |
|---|---|
| 10 | 5.3995680346 |
| 20 | 10.7991360691 |
| 30 | 16.1987041037 |
| 40 | 21.5982721382 |
| 50 | 26.9978401728 |
| 60 | 32.3974082073 |
| 70 | 37.7969762419 |
| 80 | 43.1965442765 |
| 90 | 48.596112311 |
| 100 | 53.9956803456 |