This miles per hour to knots converter gives you the mph to kn result instantly, in your browser, with the exact ratio so you can verify it. 1 mile per hour is about 0.868976 knots, and going the other way, 1 knot is 1.15078 miles per hour. Miles per hour are an imperial unit still common in the United States and the United Kingdom; knots are an SI unit used in science and engineering.
To convert by hand, multiply the number of miles per hour by 0.868976. For example, 10 miles per hour is 8.68976 knots and 100 miles per hour is 86.8976 knots. The table below lists the most requested values, and the converter above accepts decimals for anything in between.
mph to kn formula
kn = mph × 0.868976
1 mile per hour is about 0.868976 knots. Multiply the value in miles per hour by that factor to get knots.
Miles per hour to Knots conversion table
| miles per hour | knots | Rounded |
|---|---|---|
| 1 mph | 0.868976 kn | 0.869 |
| 2 mph | 1.73795 kn | 1.74 |
| 3 mph | 2.60693 kn | 2.61 |
| 4 mph | 3.4759 kn | 3.48 |
| 5 mph | 4.34488 kn | 4.34 |
| 6 mph | 5.21386 kn | 5.21 |
| 7 mph | 6.08283 kn | 6.08 |
| 8 mph | 6.95181 kn | 6.95 |
| 9 mph | 7.82079 kn | 7.82 |
| 10 mph | 8.68976 kn | 8.69 |
| 12 mph | 10.4277 kn | 10.4 |
| 15 mph | 13.0346 kn | 13 |
| 20 mph | 17.3795 kn | 17.4 |
| 25 mph | 21.7244 kn | 21.7 |
| 30 mph | 26.0693 kn | 26.1 |
| 40 mph | 34.759 kn | 34.8 |
| 50 mph | 43.4488 kn | 43.4 |
| 60 mph | 52.1386 kn | 52.1 |
| 70 mph | 60.8283 kn | 60.8 |
| 75 mph | 65.1732 kn | 65.2 |
| 80 mph | 69.5181 kn | 69.5 |
| 90 mph | 78.2079 kn | 78.2 |
| 100 mph | 86.8976 kn | 86.9 |
| 150 mph | 130.346 kn | 13 |
| 200 mph | 173.795 kn | 174 |
| 250 mph | 217.244 kn | 217 |
| 300 mph | 260.693 kn | 261 |
| 500 mph | 434.488 kn | 434 |
| 750 mph | 651.732 kn | 652 |
| 1,000 mph | 868.976 kn | 869 |
Frequently asked questions
How many knots are in 5 miles per hour?
5 mph = 4.34488 kn. Multiply 5 by 0.868976, the number of knots in one mile per hour. The converter on this page does the same arithmetic for any value, including decimals.
What is the formula to convert miles per hour to knots?
kn = mph × 0.868976. The factor comes from the definitions of the units: 1 mile per hour is about 0.868976 knots. Worked example: 12 mph = 10.4277 kn.
Is 30 mph the same as 26.0693 kn?
Yes. 30 mph = 26.0693 kn. Rounded to four decimals it is 26.07 kn.
How do I convert knots back to miles per hour?
Divide by 0.868976, or multiply by 1.15078: 1 knot is 1.15078 miles per hour. The knots to miles per hour page linked above lists common values the other way.
Is the mph to kn conversion exact?
1 mile per hour is about 0.868976 knots. The ratio is a defined constant but produces a long decimal, so this page rounds to six significant digits, which is more precision than any everyday measurement needs.