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Speed
Miles per hour to Knots
Convert miles per hour (mph) to knots (kn). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 mph = 0.868977 kn
Miles per hour to Knots Conversion Table
Common values, ready to copy:
| miles per hour | knots |
|---|---|
| 1 mph | 0.868977 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 |
| 1,000 mph | 868.98 kn |
Formula
knots = miles per hour × 8.68976993e-1
Speed is distance per unit time. 1 m/s = 3.6 km/h. 1 mph = 1.609344 km/h. 1 knot = 1.852 km/h (one nautical mile per hour).
About Miles per hour and Knots
Miles per hour (mph): Derived from the mile (1,609.344 m exactly) and the hour; conventional speed unit in the US, UK, and a handful of other countries. Common uses: US road speed limits, US sports speeds (baseball pitches in mph), UK road signs, and most US vehicle dashboards.
Knots (kn): One nautical mile per hour; a nautical mile is 1,852 m, based on one minute of arc along a meridian (so the unit is tied to Earth's geometry). Common uses: Marine navigation (ship speeds), aviation (aircraft speeds), and meteorology (wind speeds in weather reports for sailing and flying).
How the conversion works
Speed is distance per unit time. 1 m/s = 3.6 km/h. 1 mph = 1.609344 km/h. 1 knot = 1.852 km/h (one nautical mile per hour).
The exact relationship is knots = miles per hour × 8.68976993e-1, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between miles per hour and knots comes up wherever speed measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.