Speed / kn → ft/s
Convert Knots to Feet per second
Convert linear speeds in metric, customary, and nautical units. Convert Knots (kn) to Feet per second (ft/s). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Feet per second to Knots →
How to convert knots to feet per second
A knot is one international nautical mile (1852 meters) per hour. Mach is excluded because the speed of sound depends on the medium and conditions.
Use x for the value in kn, b for the intermediate value in m/s, and y for the result in ft/s.
ft/s = kn × 0.5144444444444445 ÷ 0.3048
Worked examples
10 kn ≈ 16.878098571 ft/s
Step 1: (10 × 0.514444444444) ≈ 5.14444444444 m/s.
Step 2: 5.14444444444 ÷ 0.3048 ≈ 16.878098571 ft/s.20 kn ≈ 33.756197142 ft/s
Step 1: (20 × 0.514444444444) ≈ 10.2888888889 m/s.
Step 2: 10.2888888889 ÷ 0.3048 ≈ 33.756197142 ft/s.
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About Knots
Knots (kn) measures speed under the conventions above. The base value in m/s is (x × 0.514444444444), where x is the numerical value in kn. Factors shown here are rounded for display; calculations use the stored factor.
About Feet per second
Feet per second (ft/s) measures speed under the conventions above. The base value in m/s is (x × 0.3048), where x is the numerical value in ft/s. Factors shown here are rounded for display; calculations use the stored factor.
Definitions and sources
Carry the same physical assumptions into subsequent physics calculations.
Knots to feet per second reference table
| Knots (kn) | Feet per second (ft/s) |
|---|---|
| 1 | 1.6878098571 |
| 5 | 8.43904928551 |
| 10 | 16.878098571 |
| 25 | 42.1952464275 |
| 50 | 84.3904928551 |
| 100 | 168.78098571 |
| 1000 | 1687.8098571 |
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