Unit converter
Knots to miles per hour.
Convert kn to mph and mph to kn. Type in either box and the other follows. Wind forecasts and boat speeds come in knots; one knot is 1.151 mph.
| kn | mph |
|---|---|
| 1 kn | 1.15078 mph |
| 5 kn | 5.7539 mph |
| 10 kn | 11.5078 mph |
| 15 kn | 17.2617 mph |
| 20 kn | 23.0156 mph |
| 25 kn | 28.7695 mph |
| 30 kn | 34.5234 mph |
| 40 kn | 46.0312 mph |
| 50 kn | 57.539 mph |
| 60 kn | 69.0468 mph |
- Conversion goes through m/s in both directions, so neither figure is rounded on the way.
Definitions
- The knot is one nautical mile per hour, 1.852 km/h exactly. Shipping and aviation use it because it maps onto latitude.
- The mile per hour is the speed limit unit in the UK and the US. Exactly 0.447 04 m/s.
- This conversion is exact by definition. 1 kn = 1.150779448 mph.
- Speed is converted through m/s.
How it works
One direction multiplies and the other divides by the same number, so nothing is lost by going back and forth.
The value passes through m/s, the unit every other speed unit on the site is defined against, rather than a number written into this page on its own. That is why the figure here, the figure in the table above and the general speed converter always agree.
Display precision sets a maximum number of significant figures and trims trailing zeroes, so it changes what you see and never what was calculated. The editable box always holds a plain number at full working precision, so you can carry on from either side.
Common questions this answers: how many miles per hour in a knot (1.15078), how many knots in a mile per hour (0.868976), and what 20 kn is in miles per hour (23.0156 mph).
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