Convert Miles per Hour to Knots (mph to kn)
1 mile per hour (mph) = 0.8689762419 knots (kn). 1 kn = 1.150779448 mph. Example: 15 mph = 15 × 0.8689762419 = 13.03464363 kn.
Also searched as miles per hour to kn, miles per hour in kn, miles per hour into knots, mph to kn, mph in knots, mph into knot, mile per hour to knot, mph to knots converter and how many knots in a mile per hour.
1 mph = 0.8689762419 kn
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk mile per hour to knot converter to paste a column from Excel.
How to Convert Mile per Hour to Knot
- 1 mph = 0.8689762419 kn
- 1 kn = 1.150779448 mph
- Example: convert 15 mph to kn: 15 mph = 15 × 0.8689762419 kn = 13.03464363 kn
Formula
kn = mph × 0.8689762419006
or kn = mph ÷ 1.150779448024
Derivation from SI units:
- 1 mph = 1609.344 m ÷ 3600 s = 0.44704 m/s exactly.
- 1 knot = 1 nautical mile (1852 m) per hour = 0.514444… m/s.
- 1 mph = 0.44704 m/s ÷ 0.5144444444444 m/s per kn = 0.8689762419006 kn
Both units are defined exactly, so the factor is exact. Mile per Hour definition: mile per hour; Knot definition: knot.
Worked examples
- A reading of 30 mph converts to 26.06928726 kn.
30 mph × 0.8689762419 = 26.06928726 kn - A value of 60 mph is 52.13857451 kn.
60 mph × 0.8689762419 = 52.13857451 kn
Mile per Hour to Knot conversion table
| Miles per Hour (mph) | Knots (kn) |
|---|---|
| 5 mph | 4.34488121 kn |
| 10 mph | 8.689762419 kn |
| 20 mph | 17.37952484 kn |
| 25 mph | 21.72440605 kn |
| 30 mph | 26.06928726 kn |
| 40 mph | 34.75904968 kn |
| 50 mph | 43.4488121 kn |
| 55 mph | 47.7936933 kn |
| 60 mph | 52.13857451 kn |
| 65 mph | 56.48345572 kn |
| 70 mph | 60.82833693 kn |
| 75 mph | 65.17321814 kn |
Where it's used
Miles per Hour are used for US and UK speed limits, while knots appear in aviation and marine navigation. Both measure speed (distance per time), so the conversion is a fixed factor.
Mile per Hour to other speed units
| Conversion | 1 mph equals |
|---|---|
| mile per hour to knot | 0.8689762419 kn |
| mile per hour to meter per second | 0.44704 m/s |
| mile per hour to kilometer per hour | 1.609344 km/h |
| mile per hour to foot per second | 1.466666667 ft/s |
Frequently asked questions
How many knots are in 1 mile per hour?
1 mph = 0.8689762419 kn.
How do I convert miles per hour to knots?
Multiply the value in mph by 0.8689762419, or divide it by 1.150779448. For example, 15 mph × 0.8689762419 = 13.03464363 kn.
Is the mph to kn conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "mile per hour".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (radian) and Table 8 (non-SI units accepted for use with the SI).
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Miles per Hour to Knots (mph to kn). Retrieved October 25, 2026, from https://scientificconverters.com/speed/miles-per-hour-to-knots/
IEEE
Scientific Converters, "Convert Miles per Hour to Knots (mph to kn)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/speed/miles-per-hour-to-knots/