How to convert knots to mach
To convert a measurement in knots to mach, multiply the value by 0.001511782434. The conversion factor comes from the relationship between both units and the meter per second.
For example, to convert 5 kn to mach: 5 × 0.001511782434 = 0.00755891217 Ma.
What is a knot?
A knot is a unit of speed equal to one nautical mile per hour, or exactly 1.852 km/h (about 0.514 m/s). The knot dates from the age of sail, when speed was measured by counting knots on a rope paid out behind a ship over a timed interval. It remains standard in marine and air navigation.
Common uses of knots include: Maritime navigation and ship speed; Aviation airspeed and ground speed; Wind speed in marine forecasts; Ocean current measurements.
What is a mach?
Mach is the ratio of an object's speed to the local speed of sound. Mach 1 at sea level and 15°C is about 340.29 meters per second. Named after physicist Ernst Mach, the Mach number became essential in aeronautics as aircraft approached and exceeded the speed of sound in the mid-20th century.
Common uses of mach include: Aircraft and jet speed ratings; Aerodynamics and wind-tunnel testing; Supersonic and hypersonic research; Missile and projectile speed specs.
Knots to mach worked examples
Here are some common values converted:
1 kn = 0.001511782434 Ma 5 kn = 0.00755891217 Ma 10 kn = 0.015117824339 Ma 50 kn = 0.075589121697 Ma 100 kn = 0.151178243394 Ma
Frequently asked questions
How many mach are in one knot?
One knot (kn) equals 0.001511782434 mach (Ma). Multiply any value in knots by 0.001511782434 to convert to mach.
How do I convert knots to mach?
Multiply the value in knots by 0.001511782434. For example, 5 kn × 0.001511782434 = 0.00755891217 Ma.
How do I convert mach to knots?
Multiply the value in mach by 661.470842, or divide by 0.001511782434. Use the swap button on the converter above to reverse the direction.
Is the knot to mach conversion exact?
Conversions between m/s, km/h, mph, knots and ft/s are exact by definition. Mach uses the speed of sound at sea level and 15°C (340.29 m/s), which varies with temperature and altitude.
What is the formula for knots to mach?
The formula is: Ma = kn × 0.001511782434. This comes from the definition of both units relative to the meter per second.