Knots to MPH Converter
Convert nautical speed to miles per hour and kilometres per hour. Enter a value in either field for an instant two-way result, then use the chart for common speeds.
Nautical miles per hour
Statute miles per hour
Equivalent speed
20.00 kn = 23.02 mph
That is 37.04 km/h.
Enter a speed from 0 to 100000. Use a decimal point or comma, such as 12.5 or 12,5, without thousands separators.
| Knots | mph | km/h |
|---|---|---|
| 0.00 kn | 0.00 mph | 0.00 km/h |
| 1.00 kn | 1.15 mph | 1.85 km/h |
| 5.00 kn | 5.75 mph | 9.26 km/h |
| 10.00 kn | 11.51 mph | 18.52 km/h |
| 15.00 kn | 17.26 mph | 27.78 km/h |
| 20.00 kn | 23.02 mph | 37.04 km/h |
| 25.00 kn | 28.77 mph | 46.30 km/h |
| 30.00 kn | 34.52 mph | 55.56 km/h |
| 40.00 kn | 46.03 mph | 74.08 km/h |
| 50.00 kn | 57.54 mph | 92.60 km/h |
| 60.00 kn | 69.05 mph | 111.12 km/h |
| 80.00 kn | 92.06 mph | 148.16 km/h |
| 100.00 kn | 115.08 mph | 185.20 km/h |
This is a unit converter, not a live speed test. It does not use GPS or request location permission. For a live reading, try the online GPS speedometer.
How to convert knots to mph
A knot means one nautical mile per hour. The international nautical mile is exactly 1,852 metres, and the statute mile is exactly 1,609.344 metres. Therefore 1 knot = 1852 ÷ 1609.344 mph = 1.150779448… mph. Multiply knots by that factor to convert to mph.
These factors follow the NIST conversion table and its international-nautical-mile note; NOAA's glossary defines a knot as that nautical mile per hour.
For kilometres per hour, the relationship is simpler: 1 knot = 1.852 km/h. Multiply the knot value by 1.852. For the reverse conversion, divide mph by 1.150779448… or km/h by 1.852. The converter keeps the full factors and rounds the visible answer to two decimal places.
| Convert | Formula |
|---|---|
| kn → mph | kn × (1852 ÷ 1609.344) |
| kn → km/h | kn × 1.852 |
| mph → kn | mph ÷ (1852 ÷ 1609.344) |
Knots are common in marine and aviation contexts. A converted value preserves the unit relationship, but it does not improve or verify the measurement that produced the original number. A dashboard, chartplotter, GPS device and report may use different sources or rounding rules.
Conversion or live speed?
Use this page when you already have a speed in knots and need the equivalent in mph or km/h. It works with a typed number and has no GPS dependency, so it is useful for reading a log, a chart or a specification.
If you need to see how fast you are moving now, a conversion table cannot provide that reading. The free browser speedometer uses the device's available location data after permission is granted. It is a separate live tool, not part of this calculator.
For boating context, the boat speedometer guide explains speed over ground and the difference between a converted number and a measurement. Follow posted rules and the equipment guidance relevant to your situation.
If you also want a separate iPhone speedometer for live speed and basic trip recording, the optional app is available here:
Knots to MPH — frequently asked
How do you convert knots to mph?
Multiply knots by 1852 ÷ 1609.344. This uses the exact international nautical mile of 1,852 metres and the exact statute mile of 1,609.344 metres. One knot is about 1.150779448 mph; the calculator rounds only the displayed result.
How many mph is 20 knots?
20 knots is approximately 23.02 mph, or 37.04 km/h. The converter shows both the mph result and the km/h context.
Is a knot the same as a mile per hour?
No. A knot is one nautical mile per hour, while mph uses a statute mile. One knot is approximately 1.150779448 mph, so the two numbers are different units.
Does this converter measure my current speed?
No. It converts a number you enter; it does not use GPS or request location permission. For a live GPS-based estimate, use the online speedometer while the device has permission and usable location data.