Convert Knot to Inch per Minute (kn → in/min)

Converting knots to inches per minute 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 1,216.1807

   The conversion factor from kn to in/min is 1,216.1807. Multiply your value by this number.
3. 3
   Read the result in inches per minute

   The result is your value in inches per minute (in/min).

Multiply the value in knots by 1,216.1807. For the reverse direction, multiply by 0.000822.

• ✓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 Inch per Minute?

Inches per minute is the American standard feed-rate unit for CNC machining, 3D printing, milling machines, and precision manufacturing. Machinists program tool feed rates in IPM (inches per minute) — typical values range from 5 to 100 IPM depending on material and tool. American machine controllers (Fanuc, Haas, Mazak) default to inches per minute when set to imperial mode. 3D printer feed rates are also commonly specified in IPM in US-built machines. The unit relates to inches per second (60 ipm = 1 ips), mm per minute (1 ipm = 25.4 mm/min — the metric machinist equivalent), and feet per minute (12 ipm = 1 fpm). Manufacturing CAM (computer-aided manufacturing) software allows switching between IPM and metric mm/min depending on machine controller setup.

• CNC milling and turning feed rates
• 3D printer head movement
• Some US industrial flow specifications