How to convert miles per hour to knots
1 mph ≈ 0.868976 kn
1 mph = 1,609.344 ÷ 1,852 knots, about 0.8689762 kn. The mile is exact in NIST SP 811 B.9; the 1,852 m nautical mile is exact in NIST Handbook 44.
Examples
- 96 mph = 83.421719 kn: Lowest Category 2 hurricane wind speed (NOAA National Hurricane Center)
- 130 mph = 112.96691 kn: Lowest Category 4 hurricane wind speed (NOAA National Hurricane Center)
- 100 mph = 86.897624 kn: An airspeed quoted in mph
Mph to knots chart
| Miles per hour (mph) | Knots (kn) |
|---|---|
| 1 mph | 0.86897624 kn |
| 2 mph | 1.7379525 kn |
| 3 mph | 2.6069287 kn |
| 4 mph | 3.475905 kn |
| 5 mph | 4.3448812 kn |
| 10 mph | 8.6897624 kn |
| 15 mph | 13.034644 kn |
| 20 mph | 17.379525 kn |
| 25 mph | 21.724406 kn |
| 50 mph | 43.448812 kn |
| 75 mph | 65.173218 kn |
| 96 mph | 83.421719 kn |
| 100 mph | 86.897624 kn |
| 130 mph | 112.96691 kn |
Common mistakes
- A nautical mile (1,852 m) is longer than a statute mile (1,609.344 m), so a speed in knots is always the smaller number.