To convert knots to feet per second, multiply by 1.687809857.
The calculation uses 1 kn = 1.687809857 ft/s. Results are displayed to at most 10 significant digits. Definitions can be exact while a displayed decimal is rounded. Match the displayed precision to your original measurement.
The formula
value in ft/s = value in kn × 1.687809857
kn- Input unit: knots
ft/s- Output unit: feet per second
How to use this calculator
- Enter a value in kn.
- Multiply by the stored conversion factor.
- Read the result in ft/s; divide by the same factor to convert back.
Worked examples
Worked conversion
1 kn × 1.687809857 ≈ 1.687809857 ft/s.
Reverse conversion
1.687809857 ft/s ÷ 1.687809857 ≈ 1 kn. Rounding intermediate values can change the last displayed digit.
Frequently asked questions
What factor does this converter use?
It uses 1.687809857 ft/s per kn.
Why can another converter show a slightly different answer?
Check the unit convention first (such as US versus Imperial or decimal versus binary), then compare rounding. Measurement uncertainty is separate from the unit conversion.
kn to ft/s table
| kn | ft/s (rounded) |
|---|---|
| 0 | 0 |
| 1 | 1.687809857 |
| 2 | 3.375619714 |
| 5 | 8.439049286 |
| 10 | 16.87809857 |
| 100 | 168.7809857 |
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