Nautical Mile to Kilometres
Convert nautical miles to kilometres.
Formula
Variables
Example
100 nm = 185.2 km
How it works
A nautical mile is a distance unit used in navigation and is defined by the geometry of the Earth, so it is slightly longer than a regular kilometre. The conversion factor 1.852 comes from the internationally agreed exact relationship: 1 nautical mile = 1.852 kilometres. Multiplying by 1.852 therefore changes a distance measured at sea into the equivalent distance in kilometres.
When to use it
Use this when reading charts, planning marine routes, or converting ship, aircraft, or GPS distances from nautical miles into metric units. It is also useful in any navigation or geography problem where distances are given in nautical miles but the answer is needed in kilometres.
Worked example, step by step
Convert 37 nautical miles to kilometres. Use the formula: d_{km} = 1.852 × d_{nm} Substitute the value: d_{km} = 1.852 × 37 Calculate: d_{km} = 68.524 So, 37 nm = 68.524 km
Common mistakes to avoid
- Multiplying by 1.852 when the question actually asks to convert kilometres to nautical miles
- Rounding too early and losing accuracy in the final answer
- Using the wrong unit symbol and mixing up nautical miles (nm) with miles (mi)
Did You Know?
A nautical mile equals one minute of latitude — which is why it's tied to the size of the Earth itself.
Share this formula
More in Marine & Nautical
View allHull Speed
IntermediateTheoretical top displacement speed in knots from waterline length in feet.
Speed in Knots
BasicOne knot is one nautical mile per hour.
Buoyant Force (Archimedes)
IntermediateUpward force equals the weight of displaced water.
Ship Displacement
IntermediateA floating ship displaces its own weight in water.
Draft from Displacement
AdvancedDepth of hull below waterline from displacement and waterplane area.
Froude Number
AdvancedRatio of inertia to gravity waves; governs hull resistance.