How to convert knots to miles per hour
One knot equals 1.1508 miles per hour, so multiply the number of knots by 1.1508:
mph = kn × 1.1508
kn = mph ÷ 1.1508 (1 mph = 0.868976 kn)
Example: 34 kn → 34 × 1.1508 = 39.1265 mph.
Going the other way, divide by 1.1508, or multiply by 0.868976; the miles per hour to knots converter does it for you.
Everyday values
| Knots | Miles per hour | For example |
|---|---|---|
| 1 kn | 1.1508 mph | one knot |
| 34 kn | 39.1265 mph | gale-force wind (Beaufort 8 starts at 34 kn) |
| 64 kn | 73.6499 mph | hurricane force (64 kn) |
| 100 kn | 115.078 mph | 100 knots |
When you need this conversion
Marine and aviation forecasts give wind in knots. One knot is 1.151 mph; hurricane force starts at 64 knots, or 74 mph.
Knot to mile per hour conversion table
| kn | mph | kn | mph |
|---|---|---|---|
| 5 kn | 5.7539 mph | 55 kn | 63.2929 mph |
| 10 kn | 11.5078 mph | 60 kn | 69.0468 mph |
| 15 kn | 17.2617 mph | 65 kn | 74.8007 mph |
| 20 kn | 23.0156 mph | 70 kn | 80.5546 mph |
| 25 kn | 28.7695 mph | 75 kn | 86.3085 mph |
| 30 kn | 34.5234 mph | 80 kn | 92.0624 mph |
| 35 kn | 40.2773 mph | 85 kn | 97.8163 mph |
| 40 kn | 46.0312 mph | 90 kn | 103.57 mph |
| 45 kn | 51.7851 mph | 95 kn | 109.324 mph |
| 50 kn | 57.539 mph | 100 kn | 115.078 mph |
About the units
- Knot (kn): 1 nautical mile per hour, exactly 1.852 km/h.
- Mile per hour (mph): 1 mile per hour, exactly 1.609344 km/h.
Both are units of speed. The conversion factor comes from the exact definitions above, so the calculator is exact; results are only rounded for display (up to six significant digits).
Frequently asked questions
How many miles per hour are in one knot?
One knot is 1.1508 miles per hour. One mile per hour is 0.868976 knots.
How do I convert knots to miles per hour?
Multiply the value in knots by 1.1508. To go back, divide by 1.1508.
What is 34 kn in miles per hour?
34 kn = 39.1265 mph.
What is 64 kn in miles per hour?
64 kn = 73.6499 mph.
Sources
- NIST Special Publication 811 (2008), Guide for the Use of the International System of Units (SI), Appendix B: conversion factors.
- NIST Handbook 44 (2024), Appendix C: General tables of units of measurement.
Last reviewed 5 October 2026. Results are estimates; see our disclaimer.