Convert Knot to Meter per Second (kn → m/s)

Converting knots to meters per second is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.

1. 1
   Take your value in knots

   Start with the number of knots (kn) you want to convert.
2. 2
   Multiply by 0.514444

   The conversion factor from kn to m/s is 0.514444. Multiply your value by this number.
3. 3
   Read the result in meters per second

   The result is your value in meters per second (m/s).

Multiply the value in knots by 0.514444. For the reverse direction, multiply by 1.943845.

• ✓1 knot = 1.852 km/h = 1.151 mph.
• ✓Knots cannot be abbreviated "kt" in sailing — standard is "kn".
• ✓A 40-knot wind is storm-force — 74 km/h.

• ✗Reading 40 knots as 40 km/h in weather — 74 km/h is much stronger.
• ✗Using "knots per hour" — already a rate; it's just "knots".
• ✗Treating knot as a distance unit — it's always a speed.

What is the Knot?

The knot equals exactly one nautical mile per hour (1.852 km/h or 0.5144 m/s) and is the universal speed unit for ships and aircraft worldwide. The name derives from the historical practice of measuring ship speed by counting knots tied at regular intervals along a 'log line' that was let out over the stern of a ship — the number of knots that passed in a given time gave the speed. International maritime regulations, aviation flight plans, and weather reports for sailors all use knots. A typical cruise ship sails at 18–22 knots, container ships at 18–25 knots, and commercial airliners at 470–500 knots cruise speed. The knot relates to km/h (1 knot ≈ 1.852 km/h), mph (1 knot ≈ 1.151 mph), m/s (1 knot ≈ 0.514 m/s), and the nautical mile (1 knot = 1 nmi/h). Wind speeds in aviation are also given in knots.

• Ship speeds and ocean currents
• Aircraft airspeed and ground speed
• Marine weather (wind reports in knots)

What is the Meter per Second?

Meters per second is the SI unit of speed and the standard for physics, engineering, and Olympic athletics. Defined directly from the meter (length) and second (time), m/s is the natural unit for scientific work — Newton's laws of motion, kinematic equations, and fluid dynamics all use m/s. World-class athletes reach about 12 m/s in the 100-meter sprint (Usain Bolt's record averaged 10.44 m/s), commercial airliners cruise at 240–250 m/s, and a casual walk is about 1.4 m/s. The speed of sound in air at sea level is approximately 343 m/s, and the speed of light in vacuum is 299,792,458 m/s. Wind speeds in scientific contexts use m/s, though km/h dominates weather reporting. m/s relates to km/h (1 m/s = 3.6 km/h), mph (1 m/s ≈ 2.237 mph), the knot (1 m/s ≈ 1.944 kn), and ft/s (1 m/s ≈ 3.281 fps).

• Physics and engineering calculations
• Wind speed in science and aviation
• Sprint and throw analysis in sports science