Nautical Mile to Kilometer Converter
Length · unit-converter
Convert Nautical Mile to Kilometer 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: Nautical Mile (nmi)
To: Kilometer (km)
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).
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.
How to convert nautical miles to kilometers
1 nautical mile is equal to 1.852 kilometer:
1 nmi = (1852 m ÷ 1000 m) km = 1.852 km
Each nautical mile is defined as 1852 m and each kilometer as 1000 m, so one nmi equals 1852 ÷ 1000 km = 1.852 km.
Let d(nmi) be the numeric value of the same length measured in Nautical Mile (nmi), and d(km) the value in Kilometer (km). Then:
d(km) = d(nmi) × (1852 / 1000)
Equivalently, divide by how many nmi fit into one km (meters per km divided by meters per nmi):
d(km) = d(nmi) ÷ 0.53995680345572
Or: kilometer = nautical mile ÷ 0.53995680345572
Examples
Example #1: Convert 20 nmi to kilometer
20 nmi = 20 nmi × (1852/1000) km = 37.04 km
20 nmi = 20 nmi ÷ 0.53995680345572 = 37.04 km
Example #2: Convert 50 nmi to kilometer
50 nmi = 50 nmi × (1852/1000) km = 92.6 km
50 nmi = 50 nmi ÷ 0.53995680345572 = 92.6 km
Summary
To convert Nautical Mile to Kilometer, multiply the value in nmi by the ratio of meters per nmi divided by meters per km. Equivalently: value_km = value_nmi × (1852 / 1000). Numerically, 1 nmi equals 1.852 km.
Relationship context
You are converting between nautical (navigation) (Nautical Miles) and metric (SI) (Kilometers). 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
| Nautical Mile (nmi) | Kilometer (km) |
|---|---|
| 0.1 | 0.1852 |
| 1 | 1.852 |
| 2 | 3.704 |
| 3 | 5.556 |
| 4 | 7.408 |
| 5 | 9.26 |
| 6 | 11.112 |
| 7 | 12.964 |
| 8 | 14.816 |
| 9 | 16.668 |
| Nautical Mile (nmi) | Kilometer (km) |
|---|---|
| 10 | 18.52 |
| 20 | 37.04 |
| 30 | 55.56 |
| 40 | 74.08 |
| 50 | 92.6 |
| 60 | 111.12 |
| 70 | 129.64 |
| 80 | 148.16 |
| 90 | 166.68 |
| 100 | 185.2 |