MPH to Knots Converter
Convert miles per hour to knots for marine and aviation navigation. Includes km/h and m/s with common reference speeds for boating, sailing, and piloting.
✈️ Speed📐 Knots = mph x 0.868976
Miles per hour (mph)
Please enter valid values.
Formula & Reference
| Variable | Formula | Units |
|---|---|---|
| MPH to Knots Converter | Knots = mph x 0.868976 | knots |
Step-by-Step Examples
Example 1
Highway Speed
60 mph to knots.
- 60 x 0.869 = 52.1 knots
- A fast powerboat at 52 knots is going 60 mph
✓ 52.1 knots
Example 2
Jet Speed
550 mph to knots.
- 550 x 0.869 = 477.9 knots
- Commercial jets cruise at about 450-490 knots (518-564 mph)
✓ 477.9 knots
Example 3
Wind Speed
15 mph wind to knots.
- 15 x 0.869 = 13.0 knots
- Beaufort Force 4 = 11-16 knots = 13-18 mph (moderate breeze)
✓ 13.0 knots
Real-World Applications
Sailing
Convert mph weather forecasts to knots for sailing passage planning.
Aviation
Convert ground speed and wind reports between mph and knots.
Weather
Convert National Weather Service wind speeds to navigational knots.
Marine Navigation
File float plans and calculate ETA using knots for boat speed.
Common Mistakes to Avoid
⚠️
Knots is specifically nautical speed
Knots are nautical miles per hour - used exclusively in marine and aviation contexts. Land vehicles use mph or km/h, not knots.
⚠️
Nautical miles vs statute miles
1 nautical mile = 1.1508 statute (regular) miles. 1 knot = 1 nautical mile/hour = 1.1508 mph.
⚠️
Aviation uses knots, not mph
All commercial and private aviation uses knots for airspeed (IAS, TAS, GS). Never quote aviation speeds in mph to ATC or other pilots - knots only.
Frequently Asked Questions
What is 30 knots in mph? ▾
34.52 mph. 30 knots is a fast boat speed - Category 1 hurricane starts at 64 knots = 74 mph.
Do airplanes use mph or knots? ▾
Knots exclusively in aviation worldwide. The FAA, EASA, and ICAO all mandate knots. Typical cruise: 450-490 knots (518-564 mph).
What is a nautical mile? ▾
1,852 meters = 6,076 feet = 1.1508 statute miles. One nautical mile equals one minute of latitude on the Earth's surface, making nautical charts directly usable with speed in knots.
How fast is 100 knots in mph? ▾
115.08 mph. A fast speedboat can reach 100 knots (115 mph). The fastest boats exceed 200 knots.
What is Mach 1 in knots? ▾
Mach 1 (speed of sound) = approximately 661 knots (761 mph / 1,225 km/h) at sea level, standard conditions. It varies with altitude and temperature.