Enter a speed to convert between
knots, mph, km/h and metres per second.
CONVERSION
—
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Nautical note:
A nautical mile is defined as exactly
1,852 metres. One knot means travelling
at one nautical mile per hour.
⚓ Quick nautical reference
🌊
1 knot
equals 1 nautical mile per hour,
approximately 1.15078 mph or
1.852 km/h.
🧭
1 nautical mile
is exactly 1,852 metres, or
approximately 1.15078 statute miles.
⚓
1 fathom
equals 6 feet, or exactly
1.8288 metres.
🚢
1 international cable
is one tenth of a nautical mile:
185.2 metres.
About nautical measurements
Nautical units are commonly used for
navigation at sea and in aviation.
Knots
A
knot
is a unit of speed equal to one
nautical mile per hour.
A vessel travelling at 20 knots therefore
covers 20 nautical miles in one hour.
Nautical miles
A
nautical mile
is exactly 1,852 metres.
It differs from the ordinary statute mile,
which is approximately 1,609.344 metres.
Fathoms
A
fathom
is traditionally used for measuring
water depth.
One fathom equals 6 feet, or
1.8288 metres.
Cables
Cable length has had different historical
definitions.
This converter uses the
international cable
of 185.2 metres, equal to one tenth
of a nautical mile.