Knot to Foot/Second (kn to ft/s)
Result
1.687809857 Foot/Second
Formula
ft/s = kn × 1.687809857
1 kn = 1.687809857 ft/s, and 1 ft/s = 0.5924838013 kn.
Speed units are a length divided by a time: 1 km/h = 1/3.6 m/s, 1 mph = 0.44704 m/s exactly, and 1 knot = 1 nautical mile per hour = 1,852/3,600 m/s.
Worked examples
- 1 kn × 1.687809857 = 1.6878099 ft/s
- 10 kn × 1.687809857 = 16.878099 ft/s
- 100 kn × 1.687809857 = 168.78099 ft/s
Common mistakes
- A knot is a nautical mile per hour, so 1 kn = 1.852 km/h and 1.15078 mph — not 1 mph.
- Weather services quote wind in km/h, m/s, mph or knots depending on country; check the unit before comparing forecasts.
Knot to Foot/Second table
| Knot (kn) | Foot/Second (ft/s) |
|---|---|
| 1 | 1.6878099 |
| 2 | 3.3756197 |
| 5 | 8.4390493 |
| 10 | 16.878099 |
| 20 | 33.756197 |
| 50 | 84.390493 |
| 100 | 168.78099 |
| 1,000 | 1,687.8099 |
The units
- Knot (kn)
- Knot: one nautical mile (1,852 m) per hour, used in aviation and shipping.
- Foot/Second (ft/s)
- 1 Foot/Second = 0.3048 Meter/Second.
Sources for these factors
- Guide for the Use of the International System of Units (SP 811), Appendix B: conversion factors — NIST
- Handbook 44 (2024), Appendix C: General Tables of Units of Measurement — NIST
Last reviewed against these sources. An automated check recomputes every factor from its definition on each build. How we check accuracy