knot to foot per second
Convert knot (kn) to foot per second (ft/s). Use an editable speed converter, conversion formula, and reference table.
1 kn = 1.687809857 ft/s
Conversion formula
One knot equals 1.687809857 foot per second. Multiply your value in knot by this factor to get foot per second. For the reverse conversion, divide by the same factor.
Worked example
To convert 5 knot:5 × 1.687809857 = 8.439049286 ft/s
Conversion table
| knot (kn) | foot per second (ft/s) |
|---|---|
| 0.01 | 0.01687809857 |
| 0.1 | 0.1687809857 |
| 1 | 1.687809857 |
| 2 | 3.375619714 |
| 5 | 8.439049286 |
| 10 | 16.87809857 |
| 25 | 42.19524643 |
| 50 | 84.39049286 |
| 100 | 168.7809857 |
| 1000 | 1,687.809857 |
About these measurements
Speed is distance traveled per unit of time.
The base reference used here is the meter per second. One knot is 0.5144444444 base units; one foot per second is 0.3048 base units.
Important distinctions
Mach is excluded because the speed of sound depends on medium and temperature.
Precision
The converter uses stored conversion factors and floating-point arithmetic. Results display up to ten significant digits, switching to scientific notation for very small or large values. Keep the precision of your original measurement when reporting results.
Common questions
How do I convert kn to ft/s?
Multiply the quantity in kn by 1.687809857. You can also type the value into the converter above.
Can I reverse the conversion?
Yes. Use the swap button or open the foot per second to knot converter.
Reference
NIST Guide to the SI — conversion factors and prefix conventions. SI prefixes scale units by powers of ten; the dimension-specific notes above describe the assumptions used on this page.
