Knots to ft/s (Knots to Feet per Second) Converter
1 knot equals 1.68781 feet per second — multiply knots by 1.68781 to convert. A knot is one nautical mile (6076.12 feet) per hour, and dividing that by 3,600 seconds gives 1.68781 feet per second.
The formula
Multiply the knot value by 1.68781 to get feet per second:
ft/s = kn × 1.68781
For example, 20 kn × 1.68781 = 33.7562 ft/s. To reverse, divide ft/s by 1.68781 (or multiply by 0.5924838).
Conversion table
| Knots (kn) | Feet per second (ft/s) |
|---|---|
| 1 | 1.68781 |
| 2 | 3.37562 |
| 5 | 8.43905 |
| 10 | 16.8781 |
| 25 | 42.19525 |
| 50 | 84.3905 |
| 100 | 168.781 |
| 500 | 843.905 |
| 1000 | 1687.81 |
How to convert online
- Type the number of knots in the first box.
- Read the feet-per-second result instantly in the second box.
- Enter a ft/s value to convert the other way — it works both directions.
Use the Knot to Foot per Second Converter — free and instant in your browser.
Where this conversion is used
This conversion bridges marine and aviation speed (knots) with the feet-per-second unit favored in US engineering and physics. It is handy for calculating landing and approach speeds, wind loading, and projectile or airflow problems where imperial per-second velocity is the working unit but the source figure is reported in knots.
FAQ
How many ft/s are in a knot?
One knot equals 1.68781 ft/s. Multiply the knot figure by 1.68781 — for example, 10 kn = 16.8781 ft/s.
What is the formula to convert knots to ft/s?
Use ft/s = kn × 1.68781. The tool applies this exact factor automatically so you never round by hand.
How do I convert ft/s back to knots?
Divide by 1.68781, or multiply by 0.5924838. For instance, 16.8781 ft/s = 10 kn.
Is the conversion exact?
The factor derives from the exact nautical mile (1852 m); 1.68781 is that value rounded to five places for everyday use.
Related converters
- Foot per Second to Knot Converter
- Knot to Meter per Second Converter
- Knot to Kilometer per Hour Converter
- Knot to Mile per Hour Converter
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