Knots to kilometers per hour
Type a value in knots to see it in kilometers per hour straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the knots box.
- Read the result in kilometers per hour as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
km/h = kn × 1.852
Multiply the value in knots by 1.852 to get kilometers per hour.
Example
To convert 25 kn to kilometers per hour: 25 × 1.852 = 46.3 km/h.
Conversion table
| Knots (kn) | Kilometers per hour (km/h) |
|---|---|
| 1 | 1.852 |
| 2 | 3.704 |
| 3 | 5.556 |
| 5 | 9.26 |
| 10 | 18.52 |
| 20 | 37.04 |
| 25 | 46.3 |
| 50 | 92.6 |
| 100 | 185.2 |
| 250 | 463 |
| 500 | 926 |
| 1,000 | 1,852 |
About the units
- Knot
- One nautical mile (1852 m) per hour, about 0.514444 m/s. It is the speed unit of aviation, shipping and wind reports.
- Kilometer per hour
- Covering 1000 meters in 3600 seconds, so 1 km/h is exactly 1/3.6 m/s. It is the unit on road signs and car speedometers in most countries.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many kilometers per hour are in one knot?
1 kn = 1.852 km/h exactly.
How do I convert knots to kilometers per hour?
Use km/h = kn × 1.852. For example, 25 kn = 46.3 km/h.
How many knots are in one kilometer per hour?
1 km/h = 0.539957 kn.
How do I convert km/h to m/s in my head?
Divide by 3.6, because an hour is 3600 seconds and a kilometer is 1000 meters. For example 72 km/h is 20 m/s; multiply by 3.6 to go back.
Why do Mach values differ between sources?
The speed of sound depends on air temperature. We use 340.294 m/s at sea level and 15 °C; at 11 km altitude it is about 295 m/s, so Mach 1 is slower there.