Knots to miles per hour
Type a value in knots to see it in miles 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 miles 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
mph = kn × 1.150779448
Multiply the value in knots by 1.150779448 to get miles per hour.
Example
To convert 25 kn to miles per hour: 25 × 1.150779448 = 28.7695 mph.
Conversion table
| Knots (kn) | Miles per hour (mph) |
|---|---|
| 1 | 1.15078 |
| 2 | 2.30156 |
| 3 | 3.45234 |
| 5 | 5.7539 |
| 10 | 11.5078 |
| 20 | 23.0156 |
| 25 | 28.7695 |
| 50 | 57.539 |
| 100 | 115.078 |
| 250 | 287.695 |
| 500 | 575.39 |
| 1,000 | 1,150.78 |
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.
- Mile per hour
- Covering one international mile (1609.344 m) in one hour, exactly 0.44704 m/s. It is used on roads in the United States and the United Kingdom.
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 miles per hour are in one knot?
1 kn = 1.15078 mph exactly.
How do I convert knots to miles per hour?
Use mph = kn × 1.150779448. For example, 25 kn = 28.7695 mph.
How many knots are in one mile per hour?
1 mph = 0.868976 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.