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Knot Conversion Table
This comprehensive knot conversion table shows how various units relate to knots, a unit of speed equal to one nautical mile per hour. Use this reference for quick conversions between knots and other common velocity units.
| Conversion | To Unit | Multiplier |
|---|---|---|
| Knots to meters per second | Meters per second | 0.514444 |
| Knots to kilometers per hour | Kilometers per hour | 1.852 |
| Knots to miles per hour | Miles per hour | 1.15078 |
| Knots to feet per second | Feet per second | 1.68781 |
| Knots to Mach | Mach | 0.00151178 |
| Knots to speed of light | Speed of light | 1.716e-9 |
This knot conversion reference table provides accurate conversion factors for both metric and imperial units. All values are based on internationally recognized standards for maximum precision in nautical, scientific and engineering applications.
What is a Knot?
A knot (symbol: kt) is a unit of speed equal to one nautical mile per hour. It is commonly used in meteorology, maritime navigation, and aviation. The term originates from the method of measuring a ship's speed using a "log line" - a rope with knots tied at regular intervals that was thrown overboard. Sailors would count how many knots passed over the stern in a specific time period to determine their speed.
One knot equals approximately 1.15 miles per hour or 1.85 kilometers per hour. Our knot conversion tool helps you easily convert between knots and other velocity units. For example, 10 knots equals approximately 11.5 mph or 18.5 km/h.
What is the SI of Knot?
The knot is not an SI unit, but it is accepted for use with the SI system. The SI derived unit for speed is meters per second (m/s). All other velocity units in the metric system are derived from meters per second, making it essential for SI units conversion:
- Kilometers per hour (km/h) = 0.27778 meters per second
- Feet per second (ft/s) = 0.3048 meters per second
- Miles per hour (mph) = 0.44704 meters per second
- Knot (kt) = 0.514444 meters per second
- Mach (at sea level, standard atmosphere) ≈ 340.3 meters per second
What are Knots Used For?
Knots are used in a wide range of applications where nautical or aerial speeds are measured. As a standard unit for maritime and aviation speeds, knots provide a consistent measure for velocity conversions:
Maritime Navigation
Ship speeds, current velocities, and wind speeds at sea. For example, a cruise ship might travel at 20 knots (approximately 23 mph or 37 km/h).
Aviation
Aircraft speeds, especially for smaller planes and in nautical contexts. For example, a commercial airliner cruising at 500 knots (approximately 575 mph or 926 km/h).
Meteorology
Wind speeds in weather reports and forecasts. For example, a hurricane with winds of 64 knots (74 mph) is classified as a Category 1 hurricane.
Recreation
Sailing speeds, water sports velocities, and fishing boat speeds. For example, a racing sailboat might reach speeds of 15 knots (17 mph) in optimal wind conditions.
Etymology and History
The term "knot" comes from the historical method of measuring a ship's speed using a "log line." This device consisted of a wooden board attached to a rope with knots tied at regular intervals. The board was thrown overboard, and sailors would count how many knots passed over the stern in a specific time period (measured with an hourglass) to determine their speed.
The knot was standardized in 1954 as exactly 1.852 kilometers per hour or 0.514444 meters per second. This definition connects the knot directly to the nautical mile, which is defined as exactly 1,852 meters. The adoption of this precise definition was part of the broader standardization of nautical units in the mid-20th century.
Frequently Asked Questions
Why is speed measured in knots at sea?
Knots originated from the historical "log line" method of measuring a ship's speed. The term stuck because it provided a simple, practical way to measure speed using readily available materials (rope and wood). Even after modern instruments were developed, the maritime industry continued using knots due to its widespread adoption and the convenience of relating speed to nautical miles.
How do you convert knots to mph?
To convert knots to miles per hour, multiply by 1.15078. For example, 20 knots equals 20 × 1.15078 = 23.016 mph. You can also use our knot conversion calculator above for instant, accurate conversions between knots and mph or any other velocity unit.
What's the difference between knots and mph?
Knots measure nautical miles per hour and are primarily used in maritime and aviation contexts, while mph (miles per hour) measures statute miles per hour and is commonly used on land. One knot equals approximately 1.15 mph. The difference comes from the different definitions of nautical miles (1,852 meters) versus statute miles (1,609.344 meters).
How fast is 30 knots in km/h?
30 knots equals 55.56 kilometers per hour (30 × 1.852). This is a common speed for many recreational boats and represents a good balance between fuel efficiency and travel time. Our knot converter tool can instantly convert any value from knots to km/h or other units.
Why do pilots use knots?
Pilots use knots because aviation maps and navigation systems are based on nautical miles. Using knots (nautical miles per hour) maintains consistency with these navigational tools. Additionally, wind speeds (which significantly affect flight) are also measured in knots, making flight planning and calculations more straightforward.
How do you convert knots to m/s?
To convert knots to meters per second, multiply by 0.514444. For example, 15 knots equals 15 × 0.514444 = 7.71666 m/s. This conversion is particularly useful in scientific and engineering contexts where SI units are preferred. Our velocity converter handles this and all other unit conversions automatically.
What does 10 knots feel like?
10 knots is approximately 11.5 mph or 18.5 km/h. On water, this represents a gentle breeze that creates small waves with glassy crests. For sailing, it's a light air condition that allows beginner sailors to practice basic maneuvers. Our knot conversion tool helps you understand these speeds in the units you're most familiar with.
Is 20 knots fast for a boat?
20 knots (approximately 23 mph or 37 km/h) is considered a moderate speed for recreational boats. It's fast enough for enjoyable cruising while maintaining fuel efficiency and stability. High-performance boats can exceed 50 knots, while large cargo ships typically cruise at 15-25 knots. Use our knot converter to compare these speeds in your preferred units.