Miles Per Hour to Knots
Miles per hour is the standard speed unit on road signs and speedometers in the US and UK. A knot is one nautical mile per hour, about 1.15 mph, the standard speed unit in marine and air navigation. 1 mph equals ≈0.868976 kn, so converting between them is a matter of multiplying by that fixed factor — type any value into the converter below and both sides update instantly as you type.
Both units belong to speed, measured here against speed's base unit (m/s) — every other speed unit on this site converts through that same reference point, which is why the table below can also be read as a quick cross-check against nearby values.
Formula
kn = mph × ≈0.868976
mph = kn × ≈1.15078
Worked example: 5 mph × ≈0.868976 = ≈4.34488 kn.
Conversion table
| Mile per hour (mph) | Knot (kn) |
|---|---|
| 1 mph | ≈0.868976 kn |
| 2 mph | ≈1.73795 kn |
| 3 mph | ≈2.60693 kn |
| 5 mph | ≈4.34488 kn |
| 10 mph | ≈8.68976 kn |
| 20 mph | ≈17.3795 kn |
| 25 mph | ≈21.7244 kn |
| 50 mph | ≈43.4488 kn |
| 100 mph | ≈86.8976 kn |
| 250 mph | ≈217.244 kn |
| 500 mph | ≈434.488 kn |
| 1,000 mph | ≈868.976 kn |
Frequently asked
- How many Knots in a mile per hour?
- 1 mph equals ≈0.868976 kn.
- How do I convert Miles per hour to Knots?
- Multiply the value in mph by ≈0.868976 to get kn. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Mile per hour and Knot are both defined by a fixed conversion factor to speed's base unit (m/s), so the result shown is exact to the precision displayed, not an approximation.