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Nautical Miles to km Converter

Convert nautical miles to kilometres and back — exactly 1.852 km per nautical mile. Free, instant, no sign-up, full working shown.

Convert nautical miles ⇄ kilometres

18.52 km
10 nmi = 18.52 km (1 nmi = 1.852 km (exact))

Formula: 10 nmi × KM_PER_NAUTICAL_MILE = 18.52 km

How the nautical miles to km conversion works

The converter applies km = nautical miles × 1.852. The international nautical mile is defined as exactly 1,852 metres — originally one minute of latitude — and is the unit used for sea and air navigation worldwide. Going the other way, nautical miles = km ÷ 1.852.

Worked example: a 100 nautical-mile sailing leg is 100 × 1.852 = 185.2 km, and a ship making 20 knots covers 20 × 1.852 = 37.04 km per hour. For land miles, use our miles to km converter — a statute mile is shorter, at 1.609344 km.

nautical miles to km converter questions

How many km are in a nautical mile?
Exactly 1.852 km. The international nautical mile is defined as 1,852 metres.
How do I convert nautical miles to km?
Multiply by 1.852: km = nautical miles × 1.852. So 10 nmi is 18.52 km and 100 nmi is 185.2 km. Type any figure above.
How do I convert km to nautical miles?
Divide by 1.852: nautical miles = km ÷ 1.852. So 100 km is ≈ 53.9957 nmi. Switch the direction above to do it.
What is the difference between a nautical mile and a regular mile?
A nautical mile (1.852 km) is longer than a statute, or land, mile (1.609344 km): one nautical mile is about 1.15078 statute miles. Nautical miles are used at sea and in the air because they tie directly to latitude — one nautical mile is one minute of latitude.
What is a knot?
One knot is one nautical mile per hour, or 1.852 km/h. So 20 knots is 37.04 km/h and 100 knots is 185.2 km/h.

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Sources & official guidance

Estimate only — the nautical mile is 1,852 m by international definition; conversions are exact. See our disclaimer.