Online Tool Store
Nautical Unit Converter
Convert between nautical miles, knots, and fathoms and their statute and metric equivalents, for sailing, aviation, and marine navigation. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Example
Nautical Unit Converter
- Distance
- 25 nautical miles
- Speed
- 12 knots
Example shown — replace it with your own value.
Result
12 kn = 13.81 mph = 22.22 km/h
How it works
- Enter a distance or speed in nautical units.
- Fixed conversion factors are applied to statute and metric units.
- Both equivalents appear side by side.
The conversions
1 nautical mile = 1.15078 mi = 1.852 km
1 knot = 1.15078 mph = 1.852 km/h
1 fathom = 6 ft = 1.8288 m
FAQ
What is a nautical mile based on?
One nautical mile equals one minute of latitude — about 1.852 km, or roughly 1.15 statute (land) miles. It stays constant worldwide, unlike degrees of longitude.
How is a knot different from mph?
A knot is a speed of one nautical mile per hour. 1 knot ≈ 1.15078 mph ≈ 1.852 km/h — the same ratio as the distance units.
What is a fathom used for?
A fathom (6 feet, 1.8288 m) traditionally measures water depth and is still used on nautical charts and in diving and sailing contexts.
How we compare
| Feature | Online Tool Store | Marine navigation app | Manual conversion table |
|---|---|---|---|
| No app install needed | Yes | No | Yes |
| Covers distance, speed, and depth | Yes | Varies | Rarely all three |
| Quick one-off conversion | Yes | Overkill | Slow to look up |
For a quick nautical-to-statute conversion, this is faster than opening a full navigation app.