Knots to MPH Converter
Convert between knots (kn) and miles per hour (MPH) instantly. This calculator supports bidirectional conversion with high precision, perfect for maritime navigation, aviation, weather forecasting, and sailing applications.
What Is a Knot?
A knot (kn) is a unit of speed equal to one nautical mile per hour. It is the standard unit of speed used in maritime navigation, aviation, and meteorology (for wind speeds).
The term "knot" dates back to the 17th century when sailors used a device called a common log , a piece of wood attached to a rope with evenly spaced knots. The log was thrown overboard, and the speed was determined by counting how many knots passed in a measured amount of time.
Unlike a statute mile, which is based on land distance, the nautical mile is based on the Earth's latitude and longitude coordinates. One nautical mile equals exactly 1 minute of latitude, or 1,852 meters (approximately 6,076 feet).
1 knot = 1.15078 MPH
1 MPH = 0.868976 knot
1 knot = 1.852 km/h (exactly) · 1 knot = 0.51444 m/s
The Conversion Formula
To convert from knots to MPH, multiply the speed in knots by 1.15078:
MPH = Knots × 1.15078
Knots = MPH ÷ 1.15078
The conversion factor comes from the relationship between nautical miles and statute miles: 1 nautical mile = 1,852 meters, and 1 statute mile = 1,609.344 meters. Therefore, 1 knot = 1,852 / 1,609.344 = 1.15078 MPH.
Common Speed References
- 1 knot ≈ 1.15 MPH , Base conversion
- 10 knots ≈ 11.5 MPH , Typical sailboat cruising speed
- 20 knots ≈ 23.0 MPH , Common wind speed for moderate gale
- 30 knots ≈ 34.5 MPH , Strong gale / near storm conditions
- 50 knots ≈ 57.5 MPH , Storm force winds
- 100 knots ≈ 115.1 MPH , Hurricane force winds
- Mach 1 ≈ 661.7 knots , Speed of sound at sea level
Why Use This Knots to MPH Converter?
- Bidirectional: Convert both ways , knots to MPH and MPH to knots.
- High Precision: Adjustable decimal precision from 0 to 4 places.
- Visual Chart: See the linear relationship between knots and MPH.
- Reference Table: Quick lookup for common conversion values.
- Free & Private: No registration, no data storage.
❓ Knots to MPH Converter FAQ
What is a knot?
A knot is a unit of speed equal to one nautical mile per hour. It is commonly used in maritime navigation, aviation, and meteorology. One knot is approximately 1.15 MPH.
What is the formula to convert knots to MPH?
To convert knots to miles per hour, multiply the speed in knots by 1.15078. For example, 20 knots × 1.15078 = 23.02 MPH.
What is 20 knots in MPH?
20 knots is approximately 23.02 MPH. This is a common wind speed for moderate gale conditions.
What is the difference between a knot and a mile per hour?
A knot is based on the nautical mile (1,852 meters), while MPH is based on the statute mile (1,609.344 meters). One knot is slightly faster than one MPH , about 1.15 times faster.
Why are knots used in aviation and maritime instead of MPH?
Knots are directly tied to the global latitude and longitude coordinate system. One nautical mile equals one minute of latitude, making navigation calculations much simpler.
How do I convert MPH to knots?
To convert miles per hour to knots, divide the speed in MPH by 1.15078. For example, 60 MPH ÷ 1.15078 = 52.14 knots.
What is the speed of sound in knots?
At sea level, the speed of sound is approximately 661.7 knots (about 761.5 MPH).
Is this calculator free?
Yes, this calculator is completely free to use. No registration or personal data storage is required. All calculations are performed in your browser.