Definition: Miles per hour is a unit of speed expressing the number of miles traveled in one hour.
History/origin: Common in the Imperial system, especially in the United States and the United Kingdom.
Current use: mph is standard for speed limits and vehicle speed in several countries.
Definition: A knot is a unit of speed equal to one nautical mile per hour.
History/origin: The term originated from the method of measuring a ship’s speed using a rope with knots tied at regular intervals.
Current use: Knots are used worldwide in aviation, maritime, and weather forecasting for expressing speed.
| Miles/Hour (mph) | Knots (kn) |
|---|---|
| 1.000 | 0.869 |
| 5.000 | 4.345 |
| 10.000 | 8.690 |
| 15.000 | 13.035 |
| 20.000 | 17.380 |
| 25.000 | 21.724 |
| 0.500 | 0.434 |
| 2.500 | 2.172 |
| 30.200 | 26.243 |
| 100.000 | 86.898 |
1 mile per hour ≈ 0.868976 knots
Example: convert 23.0156 mph to knots:
23.0156 ÷ 1.15078 = 20 kn