Feet per Second to Knots Converter
Convert feet per second to knots — divide by 1.688. Results update as you type; exact factors shown.
One foot per second is 0.5925 knots — see the exact factor, not a rounded rule of thumb.
How the feet per second to knots converter works
Speeds convert through meters per second. 1 km/h is 1000/3600 m/s; 1 mph is 1609.344/3600 m/s; a knot is one nautical mile (1,852 m) per hour. Mach is shown against the standard sea-level speed of sound of 340.29 m/s and varies with altitude and temperature.
The US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
Common speed conversions
| From | To | Units |
|---|---|---|
| 1 ft/s | 0.5925 kn | foot per second to knots |
| 5 ft/s | 2.9624 kn | feet per second to knots |
| 10 ft/s | 5.9248 kn | feet per second to knots |
| 17 ft/s | 10.0722 kn | feet per second to knots |
| 25 ft/s | 14.8121 kn | feet per second to knots |
| 34 ft/s | 20.1444 kn | feet per second to knots |
| 50 ft/s | 29.6242 kn | feet per second to knots |
| 68 ft/s | 40.2889 kn | feet per second to knots |
| 84 ft/s | 49.7686 kn | feet per second to knots |
| 100 ft/s | 59.2484 kn | feet per second to knots |
| 200 ft/s | 118.4968 kn | feet per second to knots |
| 500 ft/s | 296.2419 kn | feet per second to knots |
Units in this converter and their exact factors
| Unit | Symbol | One unit in meter per seconds |
|---|---|---|
| meter per second | m/s | 1 meter per second |
| kilometer per hour | km/h | 0.2777777778 meter per second |
| mile per hour | mph | 0.44704 meter per second |
| knot | kn | 0.5144444444 meter per second |
| foot per second | ft/s | 0.3048 meter per second |
| Mach (sea level, 15 °C) | Ma | 340.29 meter per second |
FAQFrequently asked questions about speed conversion
How many knots is 10 ft/s?
5.92 knots.
What is 84 ft/s?
About 50 knots.
Why convert?
Wind speeds are reported in knots in aviation and marine forecasts but in ft/s in some US engineering standards.
What is a knot in m/s?
0.5144 m/s.
What is 100 ft/s in knots?
59.2 knots.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.