Convert Knots to Feet per second
One knot equals 1.68781 feet per second. Type any value to convert knots to feet per second instantly — with a full reference table below.
Convert Knots to Feet per second
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How to convert Knots to Feet per second
To convert knots to feet per second, multiply by 1.68781. One knot equals 1.68781 ft/s, and one foot per second equals 0.592484 kn.
- Take the value in knots — for example 7.5 kn.
- Multiply by 1.68781 (the number of feet per second in one knot).
- 7.5 × 1.68781 = 12.65857 ft/s.
Quick mental estimate: Multiply the number of knots by 1.7 (within 0.7% of the exact answer).
Knots to Feet per second conversion table
| Knots | Feet per second |
|---|---|
| 1 kn | 1.68781 ft/s |
| 5 kn | 8.439049 ft/s |
| 10 kn | 16.8781 ft/s |
| 20 kn | 33.7562 ft/s |
| 25 kn | 42.19525 ft/s |
| 30 kn | 50.6343 ft/s |
| 40 kn | 67.51239 ft/s |
| 50 kn | 84.39049 ft/s |
| 60 kn | 101.2686 ft/s |
| 70 kn | 118.1467 ft/s |
| 80 kn | 135.0248 ft/s |
| 100 kn | 168.781 ft/s |
| 120 kn | 202.5372 ft/s |
| Feet per second | Knots |
|---|---|
| 1 ft/s | 0.592484 kn |
| 5 ft/s | 2.962419 kn |
| 10 ft/s | 5.924838 kn |
| 20 ft/s | 11.84968 kn |
| 25 ft/s | 14.8121 kn |
| 30 ft/s | 17.77451 kn |
| 40 ft/s | 23.69935 kn |
| 50 ft/s | 29.62419 kn |
| 60 ft/s | 35.54903 kn |
| 70 ft/s | 41.47387 kn |
| 80 ft/s | 47.3987 kn |
| 100 ft/s | 59.24838 kn |
| 120 ft/s | 71.09806 kn |
About converting Knots to Feet per second
Knots (kn) and Feet per second (ft/s) are both units of speed. The exact factor is 1 kn = 1.68781 ft/s, so multiply by 1.68781 to go from knots to feet per second (or divide to go back).
The conversion runs entirely in your browser. Need the reverse? Use the Feet per second to Knots converter, or the full unit converter for every unit at once.
Real-world speed in knots and feet per second
| Example | Knots | Feet per second |
|---|---|---|
| A walking pace | ≈ 2.721382 kn | ≈ 4.593176 ft/s |
| Usain Bolt's top speed (2009) | ≈ 24.14255 kn | ≈ 40.74803 ft/s |
| The UK motorway limit (70 mph) | 60.82834 kn | 102.6667 ft/s |
| The German Autobahn advisory speed (130 km/h) | 70.19436 kn | 118.4747 ft/s |
| The speed of sound (air, 20 °C) | ≈ 666.7387 kn | ≈ 1,125.328 ft/s |
| An airliner at cruise | ≈ 485.9611 kn | ≈ 820.21 ft/s |
“≈” marks typical values; the rest are defined or measured figures.
The units
One nautical mile (1,852 m) per hour, about 0.5144 m/s.
Used for: Aviation, shipping and marine weather.
Feet per second — exactly 0.3048 m/s.
Used for: Ballistics, engineering and US sport analytics.
km/h, mph, ft/s and knots are all defined exactly in metres per second (a knot is one nautical mile, exactly 1,852 m, per hour).