This converter turns kilometers into nautical miles instantly, using the exact factor 1 kilometer = 0.5399568035 nautical miles. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
One thousand metres — the standard road-distance unit almost everywhere outside the US and UK. Exactly 1,852 metres — one minute of latitude, the basis of marine and air navigation.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
kilometers- The amount you are converting, measured in kilometers
0.5399568035- The exact number of nautical miles in one kilometer
nautical miles- The converted result
How it works, step by step
- Enter the number of kilometers you want to convert.
- The value is multiplied by 0.5399568035, the exact conversion factor.
- The result is displayed in nautical miles, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 kilometers
Multiply 5 by 0.5399568. That gives 2.6998 nautical miles. A quick sanity check: one kilometer is smaller than one nautical mile, so the number should get smaller — and it does.
Converting 72 kilometers
72 × 0.5399568 = 38.8769 nautical miles. Working backwards, 38.8769 ÷ 0.5399568 returns 72 kilometers, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many nautical miles are in one kilometer?
Exactly 0.5399568035. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert kilometers to nautical miles?
Nautical Miles = kilometers × 0.5399568035. To reverse it, divide instead: kilometers = nautical miles ÷ 0.5399568035, which is the same as multiplying by 1.852.
Is the kilometer bigger than the nautical mile?
No. One kilometer is only 0.539957 of a nautical mile, so the nautical mile is the larger unit.
Why does my answer differ slightly from other km to nautical-miles converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a kilometer?
One thousand metres — the standard road-distance unit almost everywhere outside the US and UK.
What is a nautical mile?
Exactly 1,852 metres — one minute of latitude, the basis of marine and air navigation.
Kilometers to nautical miles reference table
| Kilometers | Nautical Miles |
|---|---|
| 0.5 km | 0.269978 nmi |
| 1 km | 0.539957 nmi |
| 2 km | 1.0799 nmi |
| 3 km | 1.6199 nmi |
| 5 km | 2.6998 nmi |
| 10 km | 5.3996 nmi |
| 15 km | 8.0994 nmi |
| 20 km | 10.7991 nmi |
| 25 km | 13.4989 nmi |
| 50 km | 26.9978 nmi |
| 75 km | 40.4968 nmi |
| 100 km | 53.9957 nmi |
| 250 km | 134.9892 nmi |
| 500 km | 269.9784 nmi |
| 1000 km | 539.9568 nmi |
Exact factor: 1 kilometer = 0.5399568035 nautical miles. Values rounded for display.