Converting Between MPH and Knots for Speed
When working with transportation speeds, you may need to convert between miles per hour (MPH) and knots. While MPH is commonly used for ground travel speeds, knots are the standard units for marine and air speeds. Converting between the two allows for consistent comparisons. This guide covers the basics of switching speeds back and forth.
The Definition of Knots
A knot is defined as one nautical mile per hour, with a nautical mile equaling 1.1508 standard miles. So by definition:
1 knot = 1 nautical mile per hour 1 nautical mile = 1.1508 miles
So knots represent speed over a slightly longer mile distance than standard land miles. The values equate to:
| 1 knot | = |1.15 mph | | 10 knots| = | 11.5 mph| | 1 mph | = | 0.87 knots |
Converting Formulas
Because a single knot covers more distance than a single MPH, you need to adjust the values when converting. The conversion formulas are:
MPH = Knots x 1.15 Knots = MPH / 1.15
Here are example values after conversion both ways:
| 65 mph | = | 56.5 knots |
| 35 knots | = | 40.3 mph |
As shown, higher speed values in MPH convert to lower knots, and vice versa. Adjusting for the nautical mile gives this difference.
Key Takeaways
To summarize MPH/knot conversions:
- Knots are maritime and air speed units based on nautical miles
- A nautical mile is 15% longer than a standard mile
- Use the formulas: MPH = Knots x 1.15 and Knots = MPH / 1.15
- Knot values are lower than MPH values for the same speed
- For mental math, knots x 1.15 gets very close to MPH
With the formulas and examples given here, you can easily convert back and forth between MPH and knots for transportation industries.
Type a value in the MPH field to convert the value to Knots:
Knots:
MPH to Knots Formula
knots=MPH/1.150779
Example:-
15 mph to knots
13.0346487031828
30 mph to knots
26.0692974063656
100 mph to knots
86.89765802121867
40 mph to knots
34.75906320848747
12 mph to knots
10.42771896254624
70 mph to knots
60.82836061485307
14 mph to knots
12.165672122970614
200 mph to knots
173.79531604243735
50 mph to knots
43.44882901060934
150 mph to knots
130.34648703182802
28 mph to knots
24.331344245941228
35 mph to knots
30.414180307426534
MPH to Knots Table chart
| Miles per hour | Knots | Miles per hour | Knots |
| 1mph | 0.87knots | 26mph | 22.59knots |
| 2mph | 1.74knots | 27mph | 23.46knots |
| 3mph | 2.61knots | 28mph | 24.33knots |
| 4mph | 3.48knots | 29mph | 25.20knots |
| 5mph | 4.34knots | 30mph | 26.07knots |
| 6mph | 5.21knots | 31mph | 26.94knots |
| 7mph | 6.08knots | 32mph | 27.81knots |
| 8mph | 6.95knots | 33mph | 28.68knots |
| 9mph | 7.82knots | 34mph | 29.55knots |
| 10mph | 8.69knots | 35mph | 30.41knots |
| 11mph | 9.56knots | 36mph | 31.28knots |
| 12mph | 10.43knots | 37mph | 32.15knots |
| 13mph | 11.30knots | 38mph | 33.02knots |
| 14mph | 12.17knots | 39mph | 33.89knots |
| 15mph | 13.03knots | 40mph | 34.76knots |
| 16mph | 13.90knots | 41mph | 35.63knots |
| 17mph | 14.77knots | 42mph | 36.50knots |
| 18mph | 15.64knots | 43mph | 37.37knots |
| 19mph | 16.51knots | 44mph | 38.23knots |
| 20mph | 17.38knots | 45mph | 39.10knots |
| 21mph | 18.25knots | 46mph | 39.97knots |
| 22mph | 19.12knots | 47mph | 40.84knots |
| 23mph | 19.99knots | 48mph | 41.71knots |
| 24mph | 20.86knots | 49mph | 42.58knots |
| 25mph | 21.72knots | 50mph | 43.45knots |
Related Converters
1. MPH to KPH
2. MPH to Knots
3. MPH to Mach
4. KPH to MPH
5. KPH to Knots
6. KPH to Mach
7. Knots to MPH
8. Knots to KPH
9. Knots to Mach
10. Mach to MPH
11. Mach to KPH
12. Mach to Knots