Knots to MPH converter
1 kn = 1.15077944802 mph
A knot is one nautical mile (exactly 1852 m) per hour, so 1 kn ≈ 1.150 78 mph. Wind forecasts, sailing and aviation all quote knots.
20 kn = 23.01558896 mph
Formula: mph = kn × 1.15077944802
20 kn in every speed unit
- metre per second
- kilometre per hour
- mile per hour
- foot per second
How to convert knots to miles per hour
mph = kn × 1.15077944802
Example: 20 kn × 1.15077944802 = 23.01558896 mph.
knot: 1 kn = 1 nautical mile per hour = 1852/3600 m/s (NIST SP 811)
mile per hour: 1 mph = 1609.344 m ÷ 3600 s = 0.447 04 m/s (NIST SP 811, App. B (1959 yard & pound agreement))
Where the number 1.1507794 comes from
Nothing is measured here. Every step below is a definition written into law or into the SI.
1 kn
Knots to MPH table
| knots (kn) | miles per hour (mph) |
|---|---|
| 1 | 1.150779 |
| 5 | 5.753897 |
| 10 | 11.50779 |
| 15 | 17.26169 |
| 20 | 23.01559 |
| 25 | 28.76949 |
| 30 | 34.52338 |
| 34 | 39.1265 |
| 35 | 40.27728 |
| 40 | 46.03118 |
| 50 | 57.53897 |
| 64 | 73.64988 |
| 75 | 86.30846 |
| 100 | 115.0779 |
| 150 | 172.6169 |
| 250 | 287.6949 |
| 450 | 517.8508 |
| 500 | 575.3897 |
Questions
How many miles per hour are in 1 knot?
1 kn = 1.15077944802 mph.
What is the formula to convert knots to miles per hour?
mph = kn × 1.15077944802. 1 kn = 1 nautical mile per hour = 1852/3600 m/s; 1 mph = 1609.344 m ÷ 3600 s = 0.447 04 m/s.
Is this conversion exact?
Yes. Both units are defined exactly (NIST SP 811; NIST SP 811, App. B (1959 yard & pound agreement)), so the factor is exact and results are only rounded for display.
What is 20 kn in mph?
20 kn = 23.01558896 mph.