Nautical Miles to Kilometers Converter
Enter the length in nautical miles below to convert it to kilometers.
Convert Nautical Miles to Kilometers
Enter a value in nautical miles (nmi) to convert to kilometers (km).
Nautical Miles to Kilometers Conversion Chart (1–40 Continuous)
Continuous 1 to 40 nautical miles lookup table with exact decimals and reduced nearest 1/64 fractions. Highlighted rows mark common shop and ruler values.
| Nautical Miles (nmi) | Decimal (km) | Fraction — Nearest 1/64 (Reduced) | Nearest 1/16 (Tape) |
|---|---|---|---|
1 nmi★ Common | 1.852 km | 1 55/64 km | 1 7/8 km |
2 nmi★ Common | 3.704 km | 3 45/64 km | 3 11/16 km |
3 nmi★ Common | 5.556 km | 5 9/16 km | 5 9/16 km |
4 nmi | 7.408 km | 7 13/32 km | 7 7/16 km |
5 nmi★ Common | 9.26 km | 9 17/64 km | 9 1/4 km |
6 nmi★ Common | 11.112 km | 11 7/64 km | 11 1/8 km |
7 nmi | 12.964 km | 12 31/32 km | 12 15/16 km |
8 nmi★ Common | 14.816 km | 14 13/16 km | 14 13/16 km |
9 nmi | 16.668 km | 16 43/64 km | 16 11/16 km |
10 nmi★ Common | 18.52 km | 18 33/64 km | 18 1/2 km |
11 nmi | 20.372 km | 20 3/8 km | 20 3/8 km |
12 nmi★ Common | 22.224 km | 22 7/32 km | 22 1/4 km |
How to Convert Nautical Miles to Kilometers
To convert nautical miles to kilometers, multiply the length by the following conversion ratio: 1.852 kilometers/nautical mile.
Since one nautical mile is equal to 1.852 kilometers, you can use this simple formula to convert:
The length in kilometers is equal to the length in nautical miles multiplied by 1.852.
For example, here's how to convert 10 nautical miles to kilometers using the formula above.
How Many Kilometers Are in a Nautical Mile?
There are 1.852 kilometers in a nautical mile, which is why we use this value in the formula above.
Our nautical mile fraction and decimal calculator can convert nautical miles and kilometers, and it automatically converts the results to US customary, imperial, and SI metric values.
Nautical Miles and kilometers are both units used to measure length. Keep reading to learn more about each unit.
What Is a Nautical Mile?
A nautical mile is a unit of length equal to 1,852 meters (m), the base unit for length. Maritime and aviation unit defined as exactly 1,852 meters. [1]
The nautical mile is classified as a standard unit of length. Nautical Miles can be abbreviated as nmi; for example, 1 nautical mile can be written as 1 nmi.
When working with nautical miles (nmi) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, nautical miles (nmi) are widely used across large-scale industrial, bulk, and macro-level length specifications within international standard workflows, engineering documentation, and technical data sheets.
What Is a Kilometer?
A kilometer is a unit of length equal to 1,000 meters (m), the base unit for length. Metric unit equal to 1,000 meters. [2]
The kilometer is classified as an International System of Units (SI) unit of length. Kilometers can be abbreviated as km; for example, 1 kilometer can be written as 1 km.
In the metric system, "kilo" is the standard SI prefix for thousands, or 10³. This makes the kilometer (km) a convenient decimal multiple of the meter (m).
In practice, kilometers (km) are widely used across large-scale industrial, bulk, and macro-level length specifications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
When converting length between nautical miles (nmi) and kilometers (km), keep full floating-point precision (1 nmi = 1.852 km; 1 km = 0.5399568 nmi) during intermediate calculations and round only the final kilometer figure to match your instrument tolerance.
More Nautical Mile & Kilometer Conversions
Need to calculate in the opposite direction? Use our kilometers to nautical miles calculator to switch your starting unit immediately. You can also explore related tools such as converting kilometers to nautical miles, converting miles to kilometers, or converting feet to kilometers.
Convert from Nautical Miles
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Length Metrology Standard — Nautical Miles (nmi) to Kilometers (km)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Nautical Mile (nmi) & Kilometer (km)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (nmi to km)