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Nautical Miles to Km Converter

Use this free nautical miles to km converter to change distances between nautical miles, kilometers, miles, meters, feet, and yards. Enter a distance, pick any two units, and the result appears instantly — along with the same distance in every other unit. It works both ways, so you can convert kilometers back to nautical miles just as easily.

Distance units at a glance

How it works

The nautical mile is the distance unit of the sea and the sky. Ships measure voyages in nautical miles, pilots measure flight legs in nautical miles, and weather reports give wind speed in knots — nautical miles per hour. It looks like the regular mile, but it is a different length, and mixing the two up is a real navigation error, so it pays to know exactly how they relate.

A nautical mile is defined by the size of the Earth itself: it is one minute of latitude, which is one sixtieth of one degree around the planet. Because the Earth is not a perfect sphere, that minute varies slightly by latitude, so the nautical mile was fixed by international agreement at exactly 1,852 meters, or 1.852 kilometers. That exact definition is what this converter uses, so every result is precise rather than approximate.

The regular mile — the statute mile used on roads — is 1,609.34 meters, which makes it shorter than the nautical mile. One nautical mile equals about 1.1508 statute miles, and one statute mile equals about 0.86898 nautical miles. So a ship that has sailed 100 nautical miles has covered 115.08 road miles, and a flight of 500 statute miles is only 434.49 nautical miles. The converter shows both figures on its "All units" line, so you can compare them directly instead of converting twice.

The knot follows straight from the nautical mile: one knot is one nautical mile per hour, which is 1.852 kilometers per hour. A ship cruising at 20 knots is moving at 37.04 kilometers per hour, and a wind of 30 knots is 55.56 kilometers per hour. Because latitude and longitude are measured in degrees and minutes, a navigator can read a distance in nautical miles straight off a chart — one minute of latitude on the chart's edge is one nautical mile on the water — which is why the unit has survived centuries of metric change.

To convert any unit to any other, the converter first changes the value into kilometers, then divides by the size of the target unit in kilometers. For example, 25 nautical miles is 25 times 1.852, which is 46.3 kilometers, and 46.3 divided by 1.60934 gives 28.77 statute miles. Going the other way, 100 kilometers divided by 1.852 is 53.9957 nautical miles. The same two steps work for meters, feet, and yards: one nautical mile is 1,852 meters, 6,076.12 feet, or 2,025.37 yards.

These conversions turn up whenever sea, air, and land meet. A ferry route listed as 12 nautical miles is 22.22 kilometers on a road map, and a pilot who needs a 10-kilometer separation from another aircraft is keeping about 5.4 nautical miles apart. A marathon is 26.2 statute miles, which is 22.77 nautical miles — a reminder that the same number means a different distance depending on which mile you mean. Enter the distance, pick the two units, and the converter keeps them straight.

Worked example

A ferry route is 25 nautical miles long. How many kilometers is that?

Step 1: Write down the conversion — 1 nautical mile = 1.852 kilometers exactly.
Step 2: Multiply — 25 × 1.852 = 46.3 kilometers.
Step 3: Check it in statute miles — 46.3 ÷ 1.60934 = 28.77 miles, and 25 × 1.1508 = 28.77 miles, which matches.

So 25 nautical miles equals 46.3 kilometers. The converter also shows the same route as 46,300 meters, 151,902.89 feet, or 50,634.30 yards, all on the same "All units" line.

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