Meters per Second to Knots
Convert meters per second (m/s) to knots (kn). Both measure velocity, and the conversion comes up in driving, aviation, sports work.
The Formula
``
knots = meters per second × 1.94384449244
meters per second = knots × 0.514444444444
`
One meters per second is 1.9438 knots, and one knot is 0.514444 meters per second.
Conversion Table
| Meters per Second | Knots |
|---|---|
| 1 m/s | 1.9438 kn |
| 2 m/s | 3.8877 kn |
| 5 m/s | 9.7192 kn |
| 10 m/s | 19.4384 kn |
| 25 m/s | 48.5961 kn |
| 50 m/s | 97.1922 kn |
| 100 m/s | 194.3844 kn |
| 500 m/s | 971.9222 kn |
| 1,000 m/s | 1,943.84 kn |
The Other Direction
| Knots | Meters per Second |
|---|---|
| 1 kn | 0.514444 m/s |
| 2 kn | 1.0289 m/s |
| 5 kn | 2.5722 m/s |
| 10 kn | 5.1444 m/s |
| 25 kn | 12.8611 m/s |
| 50 kn | 25.7222 m/s |
| 100 kn | 51.4444 m/s |
| 500 kn | 257.2222 m/s |
| 1,000 kn | 514.4444 m/s |
What Each Unit Is
Meters per Second (m/s) — the SI unit of speed — metres travelled per second. The coherent SI derived unit, used throughout physics and engineering.
Knots (kn) — one nautical mile per hour, or exactly 1.852 km/h. From the knots in a line paid out behind a ship: sailors counted knots passing in a fixed time to read speed.
A Sense of Scale
Walking is 1.4 m/s- A sprinter peaks near 12 m/s
- Sound travels at 343 m/s
- An airliner cruises at 450–500 knots
- A hurricane starts at 64 knots
Doing It in Your Head
Multiply by 33, then divide by 17. That is off by 0.14% — close enough to judge a
distance, a weight or a price, and not close enough to sign off on a drawing.
Exact Mental shortcut 19.4384 kn 19.4118 kn 194.3844 kn 194.1176 kn
Precision
The factor 1.94384449244 is rounded. For engineering work carry more digits than the table above, and round only at the end — rounding at each step compounds.
Watch Out For
- Never say "knots per hour" — the "per hour" is already in the unit.
In Code
`javascript
const meterPerSecondToKnot = (value) => value * 1.94384449244;
``
Where This Conversion Comes Up
- Driving
- Aviation
- Sports
- Shipping
- Weather
How Many Decimals Do You Need?
Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 m/s with the factor truncated at each decimal place:
| Decimals kept | Factor | 137 m/s becomes | Error |
|---|---|---|---|
| 0 | 2 | 274 | 2.8889% |
| 1 | 1.9 | 260.3 | 2.2556% |
| 2 | 1.94 | 265.78 | 0.1978% |
| 3 | 1.944 | 266.328 | 0.0080% |
| 4 | 1.9438 | 266.301 | 0.0023% |
The right number of significant figures is set by your input, not by the converter. If you measured meters per second to three significant figures, the answer in knots is only good to three — writing more digits claims precision the measurement never had.