Knot to Meter per Hour
kn
m/s
Conversion History
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Quick Reference Table (Knot to Meter per Hour)
| Knot (kn) | Meter per Hour (m/s) |
|---|---|
| 1 | 1,852.000000038686222208 |
| 5 | 9,260.000000193431111112 |
| 15 | 27,780.000000580293333336 |
| 22 | 40,744.0000008510968889 |
| 30 | 55,560.000001160586666708 |
| 60 | 111,120.00000232117333338 |
| 500 | 926,000.000019343111111524 |
About Knot (kn)
A knot is one nautical mile per hour (approximately 1.852 km/h or 1.151 mph), the standard unit of speed in maritime navigation and international aviation. Knots are used exclusively for vessels at sea and aircraft in flight because the nautical mile is tied to the geometry of the Earth — one nautical mile equals one arc-minute of latitude — making navigation calculations simpler. Commercial aircraft cruise at 450–500 knots (true airspeed). Ocean liners travel at 20–25 knots. The Beaufort wind scale used in marine forecasts is calibrated in knots.
A cruise ship travels at about 20–22 knots. Commercial airliners cruise at 450–500 knots at altitude.
Etymology: From the practice of early sailors who measured ship speed by counting the knots on a rope (a "chip log") spooled out over 28 seconds. The number of knots that ran out equalled the speed in nautical miles per hour — giving the unit its name.
About Meter per Hour (m/s)
The meter per hour (m/h) is an extremely slow unit of speed, rarely used in everyday contexts but useful for expressing very gradual movement — geological processes, biological growth, or slow industrial feed rates. One meter per hour is about 0.001 km/h or 0.00028 m/s. Glaciers move at roughly 100–3,000 m/h (0.1–3 m per hour is typical). Snails travel at about 50 m/h. The unit provides a convenient scale for phenomena that would otherwise require small decimals in m/s or km/h.
A garden snail moves at roughly 50 m/h. A glacier advances at 100–1,000 m/h depending on the ice sheet.
Knot – Frequently Asked Questions
Why do pilots and sailors use knots instead of km/h or mph?
One nautical mile equals one arc-minute of latitude anywhere on Earth. This means that at any position, a navigator can directly read distances from a chart's latitude scale without conversion. At 60 knots, for example, you cover 1 degree of latitude per hour. No equivalent mathematical elegance exists for km/h or mph, making knots uniquely convenient for celestial and GPS-assisted navigation.
What is the fastest warship speed ever achieved in knots?
The Soviet Navy's Alfa-class submarines could sustain about 44 knots submerged. On the surface, experimental high-speed craft have gone faster: the Spirit of Australia set a water speed record of 317.6 knots (588 km/h) in 1978. Modern destroyer escorts cruise at 28–34 knots. The USS Gerald R. Ford aircraft carrier sustains over 30 knots despite displacing 100,000 tonnes.
How were knots originally measured at sea?
Sailors used a "chip log" — a wooden panel attached to a rope with knots tied every 47 feet 3 inches (14.4 m). The log was thrown overboard and the rope allowed to run freely for 28 seconds (timed with a sand glass). The number of knots that passed through a sailor's hands equalled the ship's speed in nautical miles per hour. The 47-foot 3-inch spacing and 28-second interval were calculated to give a 1-to-1 ratio with the nautical mile.
Is it correct to say "knots per hour"?
"Knots per hour" is a common mistake — since a knot already means nautical miles per hour, saying "knots per hour" is like saying "miles per hour per hour," which is acceleration, not speed. The correct phrase is simply "knots" or "20 knots" not "20 knots per hour." This is a persistent error even in media reporting, as the phrase rhymes well and sounds natural.
What is the fastest commercial ship route in knots?
The HSC Francisco, a high-speed catamaran ferry operating between Buenos Aires and Montevideo, reaches 58 knots (107 km/h) — the world's fastest commercial passenger vessel. Most transatlantic container ships cruise at 20–25 knots for fuel efficiency. During the Blue Riband era of ocean liner competition, ships like the SS United States set crossing records at 35+ knots in 1952, a record that still stands.
Meter per Hour – Frequently Asked Questions
How fast does a glacier move in meters per hour?
Most valley glaciers advance at 20–200 m/h (0.5–5 m/day). Surge glaciers — which periodically accelerate — can reach 1,000–10,000 m/h for months at a time. The Jakobshavn Glacier in Greenland holds the record for the fastest sustained glacier flow at roughly 4,600 m/h (46 m/day). For context, that's still far slower than a garden snail.
How fast does hair grow in m/h?
Human scalp hair grows at roughly 15 cm per year — about 0.017 mm/hour, or 0.000017 m/h. Nails grow at about half that rate. At this scale, even the m/h unit is too large; growth biologists use mm/day or cm/month. The fastest-growing human tissue is bone marrow, not hair.
What moves at around 1 meter per hour?
Some lava flows on gently sloping terrain advance at about 1 m/h. Tectonic plates move at 2.5–15 cm/year — far below even 1 m/h. Bread rising in a warm kitchen expands at a few mm/hour. Corrosion front advancement in protected steel structures can be tracked in mm or cm per year.
Is m/h the same as m/hr?
m/h and m/hr are both used for meters per hour — neither is an official SI notation, since the SI symbol for hour is h (not hr). The correct SI notation is m/h. In engineering documentation, m/hr appears frequently as a stylistic choice, particularly in American engineering texts that prefer "hr" over "h" for legibility.
How do you convert m/h to mm/day?
Multiply by 24,000. One m/h = 1,000 mm/h × 24 h/day = 24,000 mm/day. This conversion is useful in hydrology (soil permeability is measured in mm/day) and biology (plant growth, wound healing rates). A glacier moving at 100 m/h would be advancing 2,400,000 mm/day — or 2.4 km/day, which is an exceptionally fast surge.