Mile/Hour to Knot (mph to kn)
Result
0.8689762419 Knot
Formula
kn = mph × 0.8689762419
1 mph = 0.8689762419 kn, and 1 kn = 1.150779448 mph.
Speed units are a length divided by a time: 1 km/h = 1/3.6 m/s, 1 mph = 0.44704 m/s exactly, and 1 knot = 1 nautical mile per hour = 1,852/3,600 m/s.
Worked examples
- 1 mph × 0.8689762419 = 0.86897624 kn
- 10 mph × 0.8689762419 = 8.6897624 kn
- 100 mph × 0.8689762419 = 86.897624 kn
Common mistakes
- A knot is a nautical mile per hour, so 1 kn = 1.852 km/h and 1.15078 mph — not 1 mph.
- Weather services quote wind in km/h, m/s, mph or knots depending on country; check the unit before comparing forecasts.
Mile/Hour to Knot table
| Mile/Hour (mph) | Knot (kn) |
|---|---|
| 1 | 0.86897624 |
| 2 | 1.7379525 |
| 5 | 4.3448812 |
| 10 | 8.6897624 |
| 20 | 17.379525 |
| 50 | 43.448812 |
| 100 | 86.897624 |
| 1,000 | 868.97624 |
The units
- Mile/Hour (mph)
- Miles per hour: exactly 0.44704 m/s.
- Knot (kn)
- Knot: one nautical mile (1,852 m) per hour, used in aviation and shipping.
Sources for these factors
- Guide for the Use of the International System of Units (SP 811), Appendix B: conversion factors — NIST
- Handbook 44 (2024), Appendix C: General Tables of Units of Measurement — NIST
Last reviewed against these sources. An automated check recomputes every factor from its definition on each build. How we check accuracy