Miles per hour to Knots
Miles per hour to Knots (mph to kn) Converter
Convert from
- Miles per hourmph
- Kilometres per hourkm/h
- Metres per secondm/s
- Knotskn
- Feet per secondft/s
- × speed of lightc
1 mile per hour = 0.86898 knots
Default is 5 significant figures. “Units typed as” decides what words like gallon, pint or cup mean when you type them. Scientific input such as 1e15 or 2.5e-3 works in the value box; type unit names or a whole conversion in the unit picker’s search.
- 1 mph = 0.86898 kn
- 5 mph = 4.3449 kn
- 10 mph = 8.6898 kn
- 25 mph = 21.724 kn
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How it’s calculated
A knot is one nautical mile (1 852 m) per hour, so 1 mph is about 0.86898 knots. Knots are used at sea and in aviation.
1 mph ≈ 0.86897624 kn · 1 kn ≈ 1.1507794 mph
kn = mph × 0.8689762419
- Multiply the value in miles per hour by 0.8689762419.
- To go back, divide by 0.8689762419 (or multiply by 1.150779448).
- 1 mph = 0.8689762419 kn · 1 kn = 1.150779448 mph
Step by step
Find the conversion factor
By definition 1 mph = 0.44704 m/s and 1 kn = 0.514444444444444 m/s, so 1 kn = 1.15077944802354 mph. Source: NIST SP 811 / Handbook 44.
Multiply by the factor written as a fraction
Put mph in the denominator so it cancels, leaving kn.
Calculate (unrounded)
Round the answer
Rounded to 5 significant figures.
Answer: 0.86898 kn
Formula: kn = mph × 0.8689762419. Factors last reviewed 2026-10-27.
Miles per hour to knots conversion table
1 mile per hour = 0.86898 knots · 1 kn = 1.1508 mph
- 1 mile per hour = 0.86898 knots
- 5 miles per hour = 4.3449 knots
- 10 miles per hour = 8.6898 knots
- 25 miles per hour = 21.724 knots
- 100 miles per hour = 86.898 knots
| Miles per hour (mph) | Knots (kn) |
|---|---|
| 0.1 mph | 0.086898 kn |
| 0.5 mph | 0.43449 kn |
| 1 mph | 0.86898 kn |
| 2 mph | 1.738 kn |
| 3 mph | 2.6069 kn |
| 4 mph | 3.4759 kn |
| 5 mph | 4.3449 kn |
| 6 mph | 5.2139 kn |
| 7 mph | 6.0828 kn |
| 8 mph | 6.9518 kn |
| 9 mph | 7.8208 kn |
| 10 mph | 8.6898 kn |
| 15 mph | 13.035 kn |
| 20 mph | 17.38 kn |
| 25 mph | 21.724 kn |
| 30 mph | 26.069 kn |
| 40 mph | 34.759 kn |
| 50 mph | 43.449 kn |
| 75 mph | 65.173 kn |
| 100 mph | 86.898 kn |
| 250 mph | 217.24 kn |
| 500 mph | 434.49 kn |
| 1,000 mph | 868.98 kn |
FAQ
How do I convert miles per hour to knots?
Use kn = mph × 0.8689762419. Multiply the value in miles per hour by 0.8689762419.
How many knots are in 1 mile per hour?
1 mile per hour (mph) equals 0.86898 knots (kn); more precisely 0.8689762419.
How many miles per hour are in 1 knot?
1 knot (kn) equals 1.1508 miles per hour (mph); more precisely 1.150779448.
What is 10 mph in kn?
10 miles per hour = 8.6898 knots.
What is a mile per hour?
Defined as exactly 0.44704 m/s.
What is a knot?
One nautical mile per hour, about 0.5144 m/s. Used at sea and in aviation.
About these units
Mile per hour (mph)
US & imperial (identical)
1 mph = 0.44704 m/s (exact)
Defined as exactly 0.44704 m/s.
Source: NIST SP 811 / Handbook 44
Knot (kn)
other
1 kn ≈ 0.51444444 m/s
One nautical mile per hour, about 0.5144 m/s. Used at sea and in aviation.
Source: NIST SP 811 / Handbook 44