Knots to Feet per second Converter
Convert Knots (kn) to Feet per second (ft/s) instantly, or use the conversion table below to look up common values.
Knots to Feet per second conversion table
| Knots (kn) | Feet per second (ft/s) |
|---|---|
| 1 | 1.68781 |
| 2 | 3.37562 |
| 3 | 5.06343 |
| 4 | 6.751239 |
| 5 | 8.439049 |
| 10 | 16.878099 |
| 25 | 42.195246 |
| 50 | 84.390493 |
| 100 | 168.780986 |
How to convert Knots to Feet per second
1 kn equals 1.68781 ft/s. Use the converter above for any value, or read the table for common conversions.
ft/s = kn × 1.6878098571011957 · kn = ft/s × 0.5924838012958963Multiply a knots figure by 1.68781 to get feet per second, or divide it by 0.592484 to go the other way.
Worked examples
- 1 kn= 1.68781 ft/s
- 5 kn= 8.439049 ft/s
- 10 kn= 16.878099 ft/s
- 30 kn= 50.634296 ft/s
- 50 kn= 84.390493 ft/s
What these units are
Knots (kn). A knot is one nautical mile per hour, or 0.514444 meters per second. It is the standard unit for the speed of ships and aircraft.
Feet per second (ft/s). A foot per second is 0.3048 meters per second. It is used in aviation, engineering and wind-speed figures in imperial-measure countries.
The 3.6 factor between m/s and km/h is exact, so those two convert losslessly. Knots and miles per hour are exact definitions as well.
Converting Knots to Feet per second in practice
Working in knots
A knot is exactly one nautical mile per hour, and a nautical mile is exactly 1,852 meters. One knot therefore equals exactly 1.852 kilometers per hour, a ratio that needs no rounding.
The unit belongs to marine and air navigation, where it gives vessel and aircraft speeds, wind reports at sea, and current and tidal stream rates.
A knot converts to exactly 1.852 km/h, so its metric relationships are exact. It uses the nautical mile of 1,852 meters while a mile per hour uses the statute mile, so the two must not be treated as the same unit.
The common mistake is treating a knot as a mile per hour and reusing a road speed figure at sea. The nautical and statute miles differ, so the error grows with the distance covered.
Two units sit closest to the knot: miles per hour and kilometers per hour. Navigation at sea and in the air is worked in knots, road speeds in miles per hour use that unit, and metric road and weather figures use kilometers per hour.
Checking a knots to feet per second conversion
Every speed unit is a distance over a time, so the conversion factor is just the distance factor divided by the time factor. Meters per second to kilometers per hour is a single multiplication by exactly 3.6, and a reader can hold that number.
The candidates for confusion are the mile and the nautical mile, because both appear in speed units. A knot is one nautical mile per hour, and a nautical mile is 1,852 meters against the statute mile's 1,609.344, so a knot is about 15% faster than a mile per hour. Treating the two as interchangeable understates a marine or aviation speed.
To check a speed conversion, convert it to meters per second and compare with something known, such as walking pace. The error to avoid is applying the 3.6 factor to a pair that is not m/s to km/h, when the correct move is to convert the distance and the time separately.
Tanzania reference points
Real quantities, converted into the units on this page.
The speed limit in built-up areas in Tanzania
50 km/h = 26.99784 kn = 45.567221 ft/s
Source: Road Traffic Act [Cap.168 R.E 2002] s.51, summarised by FB Attorneys · verified 2026-09-14
The maximum speed outside built-up areas for vehicles over 3,500 kg in Tanzania
80 km/h = 43.196544 kn = 72.907553 ft/s
Outside built-up areas the limit for other vehicles is set by posted signs and road markings rather than a single national figure.
Source: Road Traffic Act [Cap.168 R.E 2002] s.51, summarised by FB Attorneys · verified 2026-09-14
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