Convert Knots to Millimetres per Second
Convert Knots (kn) to Millimetres per Second (mm/s) instantly and accurately.
Conversion Formula
mm/s = kn × 514.4444444
About Knots
A knot (kn) = 1 nautical mile per hour = 1,852/3,600 m/s ≈ 0.51444 m/s - the universal speed unit for aviation and maritime navigation (ICAO and IMO standard). GA aircraft cruise 100-140 kn; commercial airliners 450-480 kn; Concorde 1,176 kn (Mach 2). Container ships 18-22 kn; QM2 exceeds 30 kn. Beaufort Force 12 hurricane begins at 64 kn. Gulf Stream surface current 2-4 kn. 1 kn = 1.852 km/h = 1.15078 mph.
About Millimetres per Second
A millimetre per second (mm/s) is 10⁻³ m/s - the speed of slow industrial mechanisms and recognisable biological motion. FDM 3D printers move at 40-120 mm/s for perimeters and 150-300 mm/s for infill. Garden snails travel 0.5-1.5 mm/s; earthworms 3-5 mm/s. CNC finishing operations run 1-several hundred mm/s. Hydraulic precision slides work at mm/s for surface preparation. Ultrasound particle velocities in soft tissue are also in this range. 1 mm/s = 10⁻³ m/s.
Quick Reference Table
| Knots (kn) | Millimetres per Second (mm/s) |
|---|---|
| 1 kn | 514.444 mm/s |
| 2 kn | 1028.89 mm/s |
| 5 kn | 2572.22 mm/s |
| 10 kn | 5144.44 mm/s |
| 25 kn | 12861.1 mm/s |
| 50 kn | 25722.2 mm/s |
| 100 kn | 51444.4 mm/s |