Convert knots to miles per hour instantly. Enter a value below, or use the formula and reference table further down the page.
In practice
Knots-to-mph is used in sailing, aviation and weather forecasting, where wind and boat speeds are stated in knots but everyday intuition runs in miles per hour. One knot is one nautical mile per hour, and a nautical mile is exactly 1,852 m, so 1 knot = 1.852 km/h = 1.15078 mph. That makes 20 knots about 23 mph and 40 knots about 46 mph — which is roughly where a wind forecast moves from 'fresh breeze' into 'gale' territory. Do not confuse knots with kilometres or statute miles per hour: the extra 15% is easy to lose if you treat them as the same.
How to convert knots to miles per hour
Multiply the value by 1.15077945.
mph = kn × 1.15077945Example: 10 kn = 11.5078 mph.
Knots to Miles per hour conversion table
| Knots (kn) | Miles per hour (mph) |
|---|---|
| 1 kn | 1.1508 mph |
| 2 kn | 2.3016 mph |
| 3 kn | 3.4523 mph |
| 4 kn | 4.6031 mph |
| 5 kn | 5.7539 mph |
| 10 kn | 11.5078 mph |
| 15 kn | 17.2617 mph |
| 20 kn | 23.0156 mph |
| 25 kn | 28.7695 mph |
| 50 kn | 57.539 mph |
| 100 kn | 115.0779 mph |
Frequently asked questions
How many miles per hour is 1 knot?
1 knot equals 1.1508 miles per hour.
What is the formula to convert kn to mph?
To convert kn to mph, multiply the value by 1.15077945. The full formula is: mph = kn × 1.15077945.
How do I convert miles per hour back to knots?
Use the same calculator above and type your value into the miles per hour field instead — it converts in both directions. Or use the reverse formula: kn = mph ÷ 1.15077945.
Is the kn to mph conversion exact?
The conversion factor used here (1.15077945) is the standard internationally defined value. Results on this page are rounded to four decimal places for readability.