A nautical mile converter translates between the distance and speed units used in maritime and aviation navigation. One nautical mile equals exactly 1.852 km — it's defined as one arc-minute of latitude, making it the natural unit for sea and air navigation. Enter any value and see all conversions instantly.
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All Distance Units
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When to Use Each Unit
How to Use the Nautical Mile Converter
The nautical mile converter handles the distance and speed units used in maritime navigation, aviation, and meteorology. One nautical mile equals exactly 1.852 km — a figure memorized by every ship captain and pilot. Understanding the relationship between these units is essential for reading navigation charts, flight plans, and weather reports.
Distance Conversion
Select "Distance" mode, enter your value, choose the input unit, and all other units update instantly. For quick reference: 1 nautical mile = 1.852 km = 1.15078 statute miles = 1,852 meters = 6,076.12 feet = 2,025.37 yards. The input unit is highlighted in the results so you can compare at a glance.
Speed Conversion (Knots)
Switch to "Speed" mode for knot conversions. A knot is one nautical mile per hour. Aircraft cruise speed, wind speed in weather forecasts, and ship speed are all reported in knots. A typical commercial airliner cruises at about 500 knots (926 km/h), while a large cargo ship travels at 10-15 knots (18.5-27.8 km/h). Tropical storm winds are classified starting at 34 knots (39 mph).
Why Nautical Miles Matter for Navigation
Earth's circumference is approximately 21,600 nautical miles — exactly 360 degrees × 60 arc-minutes per degree. This means navigating by latitude and longitude is natural: moving 1° of latitude changes position by exactly 60 nautical miles. Moving 10° of latitude = 600 nm, moving 30° = 1,800 nm. No conversion factor needed. Statute miles have no such geometric relationship to Earth's coordinate system, making them unsuitable for ocean navigation.
Common Navigation Distances
For reference: English Channel crossing ≈ 21 nm (38.9 km). New York to London air route ≈ 3,000 nm (5,556 km). San Francisco to Honolulu ≈ 2,085 nm (3,861 km). A cable (nautical) = 0.1 nm = 185.2 meters, used for short-range navigation. A league (maritime) = 3 nm = 5.556 km, the origin of "20,000 leagues under the sea."
FAQ
Is this nautical mile converter free?
Yes, completely free with no signup or account required. All conversions happen instantly in your browser.
What is a nautical mile?
A nautical mile is exactly 1,852 meters (1.852 km or approximately 1.15078 statute miles). It's defined as one arc-minute of latitude along Earth's meridian, which makes it the natural unit for maritime and aviation navigation — traveling 60 nautical miles north changes your latitude by exactly 1 degree.
How many kilometers is one nautical mile?
One nautical mile equals exactly 1.852 kilometers. This is an internationally defined exact value, not an approximation. So 10 nm = 18.52 km, 100 nm = 185.2 km, and 1,000 nm = 1,852 km.
How many statute miles is one nautical mile?
One nautical mile equals approximately 1.15078 statute miles. Conversely, one statute mile equals approximately 0.8684 nautical miles. This is why maritime distances are always longer than the same figure in regular miles.
What is a knot in terms of speed?
One knot is one nautical mile per hour. A ship traveling at 20 knots covers 20 nautical miles each hour, which equals 37.04 km/h or 23.02 mph. The word 'knot' comes from the historical method of measuring ship speed with a log-line with knots tied at regular intervals.
Why do ships and planes use nautical miles?
Nautical miles are tied directly to Earth's geometry — 1 nm equals 1 arc-minute of latitude. This makes position calculation and navigation far simpler. Charts are drawn in nautical miles, and latitude lines serve as built-in distance scales. Aviation adopted the same unit for international standardization.
Is a nautical mile the same everywhere?
Yes. Since 1954, the international nautical mile has been standardized at exactly 1,852 meters worldwide. Before that, different countries used slightly different values (the US used 1,853.248 m until 1954). Modern charts and GPS systems all use the 1,852 m definition.