Knot to Metre per Second
Free instant knot to metre per second converter. 1 kn = 0.514444 m/s.
Common Knot to Metre per Second values
| Knot (kn) | Metre per Second (m/s) |
|---|---|
| 1 | 0.514444 |
| 5 | 2.57222 |
| 10 | 5.14444 |
| 25 | 12.8611 |
| 50 | 25.7222 |
| 100 | 51.4444 |
| 500 | 257.222 |
| 1000 | 514.444 |
How does Knot to Metre per Second conversion work?
Type a value in the Knot (kn) field and the equivalent in Metre per Second (m/s) appears instantly to the right. The math uses the exact formula shown above — no rounding errors, no approximations beyond standard floating-point precision. Use the swap button to flip the units and see the inverse conversion.
Knot. One nautical mile per hour. Used in marine and air navigation.
Metre per Second. The SI unit of speed. Used in physics. 10 m/s is roughly Olympic-sprinter pace.
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🎯 Accurate conversions
Conversion factors come from the official standard (NIST, BIPM, ISO definitions where applicable). Values are precise to standard floating-point limits.
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How it works — the formula
value_in_base = value × scale
For speed, scale = m/s per unit (e.g. 1 km/h = 1/3.6 m/s, 1 mph = 0.44704 m/s)Speed combines a length unit with a time unit, so its conversions follow from the length and time tables. 1 m/s = 3.6 km/h exactly (since 1 km = 1000 m and 1 h = 3600 s). 1 mph = 0.44704 m/s exactly (since 1 mi = 1609.344 m). 1 knot = 1 nautical mile per hour = 1852 / 3600 m/s ≈ 0.514444 m/s exactly. Mach number is dimensionless (ratio to local sound speed) and depends on temperature; "1 Mach at sea level standard atmosphere" is approximately 340.29 m/s (ISA, 15 °C).
Worked examples
- Inputs:
- 60 mph = ? km/h
- Output:
- 60 × 1.609344 ≈ 96.5606 km/h
- Inputs:
- 15 knots = ? m/s
- Output:
- 15 × 0.514444 ≈ 7.7167 m/s
- Inputs:
- 100 km/h = ? mph
- Output:
- 100 / 1.609344 ≈ 62.1371 mph
Limitations
- Mach number depends on temperature (sound speed varies with √T) — a "1 Mach" speed at altitude is a different m/s than at sea level.
- GPS-reported speeds use ground-track distance and may differ from instrument speed in cross-winds (aircraft) or currents (boats).
- Speedometer accuracy is regulated to ±5–10% in most jurisdictions — converted readings inherit that tolerance.
- Average vs instantaneous speed are different quantities; this calculator converts whatever value you supply.
Conversions are exact rational arithmetic for SI ↔ US-customary ↔ marine units; Mach uses an ISA standard sound speed and should not be used for engineering analysis.