Kilometres to Nautical miles Converter

Convert kilometres (km) to nautical miles (nmi) instantly. Enter a value in kilometres and this converter returns the equivalent in nautical miles, using the exact factor of 0.539956803. One kilometre is 0.539956803 nautical miles, and one nautical mile is 1.852 kilometres, so you can convert either way. The factor follows the standard definitions of the metre and the international inch, so it is consistent and reliable for school work, trade, engineering, travel and everyday measuring. The formula, a worked example and a quick-reference table are below.

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Value in kilometres (km)

1 km =0.539956803 nmi

1 nmi =1.852 km

The formula

Multiply kilometres by 0.539956803 to get nautical miles. In symbols, nmi = km × 0.539956803. To go the other way, multiply nautical miles by 1.852 to get kilometres.

Worked example

Convert 10 kilometres to nautical miles: 10 × 0.539956803 = 5.39956803 nautical miles.

Quick reference

Kilometres	Nautical miles
1 km	0.539956803 nmi
2 km	1.07991361 nmi
5 km	2.69978402 nmi
10 km	5.39956803 nmi
25 km	13.4989201 nmi
50 km	26.9978402 nmi
100 km	53.9956803 nmi

Frequently asked questions

How many nautical miles are in one kilometre?

One kilometre equals 0.539956803 nautical miles. Multiply the number of kilometres by 0.539956803 to convert.

What is the formula to convert kilometres to nautical miles?

Kilometres times 0.539956803 equals nautical miles. To reverse it, multiply nautical miles by 1.852 to get kilometres.

Is the km to nmi conversion exact?

The factor comes from the standard definitions of the metre and the international inch (0.0254 m exactly), so the underlying conversion is exact. Displayed results are rounded for readability.

Who this converter is for

This converter is for students, tradespeople, travellers and anyone who needs to change kilometres into nautical miles quickly and accurately.

What this converter assumes

You enter a length in kilometres.
The factor used is 0.539956803 nautical miles per kilometre.
Results are rounded for display.

Sources

Related converters

Length Converter: convert between any length units.
Unit Converter: convert many kinds of units.
Kilometres to Inches Converter: convert kilometres to inches.
Kilometres to Feet Converter: convert kilometres to feet.

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