Knots to mph
Type knots (kn), see miles per hour (mph).
By Akash Yadav Updated 27 September 2026
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The formula
How to convert knots to mph
To change knots into mph, multiply by 1.150779448024.
mph = knots × 1.150779448024
Going the other way: knots = mph × 0.868976241901
1 knot = 1.15077945 mph. This factor does not end, so results on this page are rounded.
Worked example
You have 20 knots. Multiply by 1.150779448024. 20 × 1.150779448024 = 23.0156 mph.
Common values
Knots to mph conversion table
| Knots (kn) | Mph (mph) |
|---|---|
| 1 kn | 1.1508 mph |
| 2 kn | 2.3016 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 |
| 30 kn | 34.5234 mph |
| 40 kn | 46.0312 mph |
| 50 kn | 57.539 mph |
| 64 kn | 73.6499 mph |
| 100 kn | 115.0779 mph |
| 150 kn | 172.6169 mph |
| 250 kn | 287.6949 mph |
| 500 kn | 575.3897 mph |
Before you rely on it
A knot is a nautical mile per hour
1 knot is 1 nautical mile per hour, and a nautical mile is exactly 1852 meters — about 15 percent longer than the 1609.344-meter land mile. So a knot is about 1.15 mph, never 1.
The "per hour" is already inside the word. "Knots per hour" would be an acceleration; a boat doing 20 knots is doing 20 nautical miles an hour.
Knots are used at sea, in aviation and in marine weather forecasts. A hurricane begins at 64 knots of sustained wind, which is about 74 mph — the reason US forecasts give 74 mph as the threshold.
For a quick estimate, add 15 percent: 20 knots is roughly 23 mph. The factor itself, about 1.1508, does not end, so results on this page are rounded.
Common questions
Frequently asked questions
How many mph is 1 knot?
1 knot is about 1.1508 mph.
How many mph is 10 knots?
10 knots is about 11.51 mph.
How many mph is 20 knots?
20 knots is about 23.02 mph.
How many mph is 30 knots?
30 knots is about 34.52 mph.
Is a knot faster than a mile per hour?
Yes. A nautical mile is longer than a land mile, so 1 knot is about 1.15 mph.
How many knots is 100 mph?
100 mph is about 86.9 knots.
Keep going
Related converters
Every factor on this page is listed in our conversion methodology.