Convert Knot to Kilometer per Hour (kn → km/h)

Converting knots to kilometers per hour 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 1.852

   The conversion factor from kn to km/h is 1.852. Multiply your value by this number.
3. 3
   Read the result in kilometers per hour

   The result is your value in kilometers per hour (km/h).

Multiply the value in knots by 1.852. For the reverse direction, multiply by 0.539957.

• ✓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 Kilometer per Hour?

Kilometers per hour is the universal road-speed and weather wind-speed unit in 195 countries — every nation outside the United States, the United Kingdom, and a handful of Caribbean territories. Speed limits on European, Asian, Australian, African, and Latin American roads are posted in km/h: typical urban limits are 50 km/h, highway 100–130 km/h. Weather reports give wind speeds in km/h universally. The unit derives directly from the kilometer (distance) and hour (time): 1 km/h ≈ 0.278 m/s. Car speedometers in metric countries display km/h prominently, with smaller mph numbers for travel to the UK. Olympic 100-meter sprints reach 36–37 km/h, urban cyclists travel at 15–25 km/h, and commercial trains in Europe cruise at 200–300 km/h. The unit relates to mph (1 km/h ≈ 0.621 mph), m/s (3.6 km/h = 1 m/s), and the knot (1 km/h ≈ 0.540 kn).

• European and global road speed limits
• Car and motorcycle speedometers
• Weather wind speed reporting (in some regions)