Nautical Units Converter
Convert sea units in seconds: nautical miles, knots, fathoms, cables and more. Two handy panels cover both distance and speed — type a value, pick the units, and the result updates live. Built for sailors, students, and anyone reading charts or marine specs.
Distance Units
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Speed Units
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How to use
- Enter your value in the boxes above or select an option.
- The result updates live — you do not need to press any button.
- Change a value or unit and the new result appears on its own.
Note
1 nautical mile = 1,852 metre exact. 1 knot = 1 nautical mile per hour. Fathom (6 feet) is used to measure sea depth and cable (0.1 nautical mile) is used for distance.
Tips
- One knot equals one nautical mile per hour — speed and distance use the same mile.
- The top panel converts distance units, the bottom panel converts speed units.
- Results update live as you type — there is no button to press.
- Fathoms and cables are handy when reading older charts and depth tables.