Length converter
Nautical Miles to Kilometers
Nautical Miles and Kilometers measure the same quantity in different unit systems. The relationship is 1 nmi = 1.852 km, which gives 1.852 km per nmi. Below you can convert any value, check a worked example and read the full chart.
Formula 1 nmi = 1.852 km
Need the other direction? Kilometers to Nautical Miles.
How to convert Nautical Miles to Kilometers
The nautical mile is exactly 1,852 metres and equals one minute of latitude. The kilometre is 1,000 metres and is the standard road-distance unit in most countries.
To convert Nautical Miles to Kilometers, multiply the value in nmi by 1.852. For example, 10 nmi × 1.852 = 18.52 km. This works because the ratio between the two units is constant for every value in length.
Worked examples
| nmi | km |
|---|---|
| 1 nmi | 1.852 km |
| 2.5 nmi | 4.63 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 |
Reverse conversion
| km | nmi |
|---|---|
| 1 km | 0.5399568 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 |
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 nmi is 1,852 km.
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.
nmi to km 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.
| Nautical Miles (nmi) | Kilometers (km) |
|---|---|
| 1 nmi | 1.852 km |
| 2 nmi | 3.704 km |
| 3 nmi | 5.556 km |
| 4 nmi | 7.408 km |
| 5 nmi | 9.26 km |
| 6 nmi | 11.112 km |
| 7 nmi | 12.964 km |
| 8 nmi | 14.816 km |
| 9 nmi | 16.668 km |
| 10 nmi | 18.52 km |
| 11 nmi | 20.372 km |
| 12 nmi | 22.224 km |
| 13 nmi | 24.076 km |
| 14 nmi | 25.928 km |
| 15 nmi | 27.78 km |
| 16 nmi | 29.632 km |
| 17 nmi | 31.484 km |
| 18 nmi | 33.336 km |
| 19 nmi | 35.188 km |
| 20 nmi | 37.04 km |
| 21 nmi | 38.892 km |
| 22 nmi | 40.744 km |
| 23 nmi | 42.596 km |
| 24 nmi | 44.448 km |
| 25 nmi | 46.3 km |
| 26 nmi | 48.152 km |
| 27 nmi | 50.004 km |
| 28 nmi | 51.856 km |
| 29 nmi | 53.708 km |
| 30 nmi | 55.56 km |
| 31 nmi | 57.412 km |
| 32 nmi | 59.264 km |
| 33 nmi | 61.116 km |
| 34 nmi | 62.968 km |
| 35 nmi | 64.82 km |
| 36 nmi | 66.672 km |
| 37 nmi | 68.524 km |
| 38 nmi | 70.376 km |
| 39 nmi | 72.228 km |
| 40 nmi | 74.08 km |
| 41 nmi | 75.932 km |
| 42 nmi | 77.784 km |
| 43 nmi | 79.636 km |
| 44 nmi | 81.488 km |
| 45 nmi | 83.34 km |
| 46 nmi | 85.192 km |
| 47 nmi | 87.044 km |
| 48 nmi | 88.896 km |
| 49 nmi | 90.748 km |
| 50 nmi | 92.6 km |
| 60 nmi | 111.12 km |
| 70 nmi | 129.64 km |
| 80 nmi | 148.16 km |
| 90 nmi | 166.68 km |
| 100 nmi | 185.2 km |
Frequently asked questions
How many Kilometers are in 1 Nautical Miles?
1 nmi equals 1.852 km.
How do I convert Nautical Miles to Kilometers?
Multiply the nmi value by 1.852. Example: 25 nmi = 46.3 km.
What is 2.5 nmi in km?
2.5 nmi = 4.63 km.
Is the nmi to km 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.