MPH to Knots Converter
Type a value in miles per hour to see it in knots as you type, with the exact formula and a reference chart.
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- Kilometers per hour
- 48.28 km/h
How this was calculated
- 1 knot = 1.150779448 miles per hour
- 30 ÷ 1.150779448 = 26.069287 kn
| mph | kn |
|---|---|
| 1 mph | 0.868976 kn |
| 5 mph | 4.34488 kn |
| 10 mph | 8.68976 kn |
| 15 mph | 13.0346 kn |
| 20 mph | 17.3795 kn |
| 25 mph | 21.7244 kn |
| 30 mph | 26.0693 kn |
| 40 mph | 34.759 kn |
| 50 mph | 43.4488 kn |
| 60 mph | 52.1386 kn |
| 74 mph | 64.3042 kn |
| 100 mph | 86.8976 kn |
| 150 mph | 130.346 kn |
| 200 mph | 173.795 kn |
| kn | mph |
|---|---|
| 1 kn | 1.15078 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 |
| 35 kn | 40.2773 mph |
| 40 kn | 46.0312 mph |
| 50 kn | 57.539 mph |
| 60 kn | 69.0468 mph |
| 64 kn | 73.6499 mph |
How to convert miles per hour to knots
1 mile per hour = 0.8689762419 knots. To convert miles per hour to knots, divide by 1.150779448 (or multiply by 0.8689762419). One mile per hour is 1,609.344 m covered in one hour. A knot is one nautical mile (exactly 1,852 m) per hour.
Worked examples
- 10 miles per hour = 8.68976 kn (10 ÷ 1.1507794)
- 30 miles per hour = 26.0693 kn (30 ÷ 1.1507794)
- 100 miles per hour = 86.8976 kn (100 ÷ 1.1507794)
Where this conversion comes up
Miles per hour are used for speed limits and car speedometers in the US and UK; knots for boat and aircraft speed, wind at sea and in aviation. Boaters and pilots convert land speeds to knots. One knot is 1.1508 mph, so 100 mph is 86.9 kn.
Quick estimate
Subtract 13% (exact factor 0.869).
Common mistakes
- Multiplying instead of dividing. A knot is larger than a mile per hour, so the number of knots must come out smaller: 10 miles per hour = 8.68976 kn.
- Rounding too early. Keep the full factor until the last step; rounding 0.869 to 0.9 first puts large values noticeably off.
Going the other way? Use the knots to mph converter. Related speed converters: kph to mph, mph to kph, mph to m/s, m/s to mph, fps to mph, mph to fps.
Frequently asked questions
How do you convert miles per hour to knots?
Multiply the miles per hour by 0.8689762419 (or divide by 1.150779448). For example, 30 miles per hour is 26.0693 knots.
How many knots are in one mile per hour?
One mile per hour is 0.8689762419 knots. One mile per hour is 1,609.344 m covered in one hour.
What is 100 miles per hour in knots?
100 miles per hour is 86.8976 knots.
Is there a quick way to estimate miles per hour to knots?
Subtract 13% (exact factor 0.869).