Convert miles per hour to knots
Enter a value in miles per hour to convert it to knots.
miles per hour to knots reference
| miles per hour | knots |
|---|---|
| 1 mph | 0.869 kn |
| 2 mph | 1.738 kn |
| 5 mph | 4.3449 kn |
| 10 mph | 8.6898 kn |
| 25 mph | 21.7244 kn |
| 50 mph | 43.4488 kn |
| 100 mph | 86.8977 kn |
The conversion factor
One mile per hour is 0.86897699 knots. So to convert, multiply your figure in miles per hour by 0.86897699. To go the other way, multiply knots by 1.15077845, or use the knots to miles per hour converter.
Doing it in your head
For a quick estimate, round the factor: roughly "divide by 1". Use the exact converter above when the number matters.
Where this conversion comes up
Driving abroad, running and cycling pace, wind speed, and vehicle specs.
See the common unit conversions cheat sheet for the factors worth memorising.
Related tools
Frequently asked questions
How many knots are in a mile per hour?
1 mile per hour = 0.868977 knots.
What is the formula to convert miles per hour to knots?
Multiply the number of miles per hour by 0.86897699. To go back the other way, multiply knots by 1.15077845.
What is 10 miles per hour in knots?
10 miles per hour = 8.6898 knots. The reference table below lists more common values.
Is this converter accurate?
It uses the internationally defined conversion factors and computes at full floating-point precision, then rounds only the displayed result. For everyday purposes it is exact; for legal, engineering or scientific work, confirm the required number of significant figures.
Does it work offline?
Yes. The conversion runs in your browser with no server call, so it keeps working with no connection, and nothing you enter is uploaded.
Last reviewed: September 2026. Figures and formulas are checked against their published sources; see the site's data notes.