Length converter
Kilometers to Nautical Miles
If you need to know how many Nautical Miles one Kilometers contains, the answer is 0.5399568. The conversion is linear, so 10 km is 5.399568 nmi and 100 km is 53.99568 nmi. Use the converter for any other value.
Formula 1 km = 0.5399568 nmi
Need the other direction? Nautical Miles to Kilometers.
How to convert Kilometers to Nautical Miles
The kilometre is 1,000 metres and is the standard road-distance unit in most countries. The nautical mile is exactly 1,852 metres and equals one minute of latitude.
To convert Kilometers to Nautical Miles, multiply the value in km by 0.5399568. For example, 10 km × 0.5399568 = 5.399568 nmi. This works because the ratio between the two units is constant for every value in length.
Worked examples
| km | nmi |
|---|---|
| 1 km | 0.5399568 nmi |
| 2.5 km | 1.349892 nmi |
| 5 km | 2.699784 nmi |
| 10 km | 5.399568 nmi |
| 25 km | 13.49892 nmi |
| 50 km | 26.99784 nmi |
| 100 km | 53.99568 nmi |
Reverse conversion
| nmi | km |
|---|---|
| 1 nmi | 1.852 km |
| 5 nmi | 9.26 km |
| 10 nmi | 18.52 km |
| 25 nmi | 46.3 km |
| 50 nmi | 92.6 km |
| 100 nmi | 185.2 km |
When this conversion is useful
This is the calculation you need when you are working across metric and imperial measurements, shopping abroad or reading a spec sheet. Because the factor is fixed, you can use the same number for a single measurement or for a batch: 1,000 km is 539.956803 nmi.
Is the conversion exact?
Yes for practical use: the factors come from international definitions, with rounding applied only for display.
Reference: BIPM SI Brochure and NIST SP 811. Last reviewed: 2026-11-01.
km to nmi conversion chart
The chart lists the most requested values. For a value that is not here, use the converter at the top of the page.
| Kilometers (km) | Nautical Miles (nmi) |
|---|---|
| 1 km | 0.5399568 nmi |
| 2 km | 1.079914 nmi |
| 3 km | 1.61987 nmi |
| 4 km | 2.159827 nmi |
| 5 km | 2.699784 nmi |
| 6 km | 3.239741 nmi |
| 7 km | 3.779698 nmi |
| 8 km | 4.319654 nmi |
| 9 km | 4.859611 nmi |
| 10 km | 5.399568 nmi |
| 11 km | 5.939525 nmi |
| 12 km | 6.479482 nmi |
| 13 km | 7.019438 nmi |
| 14 km | 7.559395 nmi |
| 15 km | 8.099352 nmi |
| 16 km | 8.639309 nmi |
| 17 km | 9.179266 nmi |
| 18 km | 9.719222 nmi |
| 19 km | 10.259179 nmi |
| 20 km | 10.799136 nmi |
| 21 km | 11.339093 nmi |
| 22 km | 11.87905 nmi |
| 23 km | 12.419006 nmi |
| 24 km | 12.958963 nmi |
| 25 km | 13.49892 nmi |
| 26 km | 14.038877 nmi |
| 27 km | 14.578834 nmi |
| 28 km | 15.11879 nmi |
| 29 km | 15.658747 nmi |
| 30 km | 16.198704 nmi |
| 31 km | 16.738661 nmi |
| 32 km | 17.278618 nmi |
| 33 km | 17.818575 nmi |
| 34 km | 18.358531 nmi |
| 35 km | 18.898488 nmi |
| 36 km | 19.438445 nmi |
| 37 km | 19.978402 nmi |
| 38 km | 20.518359 nmi |
| 39 km | 21.058315 nmi |
| 40 km | 21.598272 nmi |
| 41 km | 22.138229 nmi |
| 42 km | 22.678186 nmi |
| 43 km | 23.218143 nmi |
| 44 km | 23.758099 nmi |
| 45 km | 24.298056 nmi |
| 46 km | 24.838013 nmi |
| 47 km | 25.37797 nmi |
| 48 km | 25.917927 nmi |
| 49 km | 26.457883 nmi |
| 50 km | 26.99784 nmi |
| 60 km | 32.397408 nmi |
| 70 km | 37.796976 nmi |
| 80 km | 43.196544 nmi |
| 90 km | 48.596112 nmi |
| 100 km | 53.99568 nmi |
Frequently asked questions
How many Nautical Miles are in 1 Kilometers?
1 km equals 0.5399568 nmi.
How do I convert Kilometers to Nautical Miles?
Multiply the km value by 0.5399568. Example: 25 km = 13.49892 nmi.
What is 2.5 km in nmi?
2.5 km = 1.349892 nmi.
Is the km to nmi conversion exact?
Yes for practical use: the factors come from international definitions, with rounding applied only for display.
Does the calculator work offline?
Yes. The conversion runs in your browser with JavaScript, so it works after the page has loaded, even without a connection.