Mach to Knots Converter
Enter the speed in mach below to convert it to knots.
Convert Mach to Knots
Enter a value in mach (Mach) to convert to knots (kn).
Mach to Knot Conversion Table
Table showing various mach measurements converted to knots. Click any preset value or arrow to load it into the converter.
| Mach (Mach) | Knots (kn) |
|---|---|
| 1 Mach | 661.4708423 kn |
| 2 Mach | 1,322.9416847 kn |
| 2.5 Mach | 1,653.6771058 kn |
| 5 Mach | 3,307.3542117 kn |
| 10 Mach | 6,614.7084233 kn |
| 15 Mach | 9,922.062635 kn |
| 20 Mach | 13,229.4168467 kn |
| 25 Mach | 16,536.7710583 kn |
| 30 Mach | 19,844.12527 kn |
| 50 Mach | 33,073.5421166 kn |
How to Convert Mach to Knots
To convert mach to knots, multiply the speed by the following conversion ratio: 661.4708423 knots/mach.
Since one mach is equal to 661.4708423 knots, you can use this simple formula to convert:
The speed in knots is equal to the speed in mach multiplied by 661.4708423.
For example, here's how to convert 5 mach to knots using the formula above.
How Many Knots Are in a Mach?
There are 661.4708423 knots in a mach, which is why we use this value in the formula above.
Our mach to knot calculator automatically converts your speed measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Mach and knots are both units used to measure speed. Keep reading to learn more about each unit.
What Is a Mach?
A mach is a unit of speed equal to 340.29 meters per second (m/s), the base unit for speed. Speed of sound at 15 °C sea level (340.29 m/s = 1,225.04 km/h). [1]
The mach is classified as a standard unit of speed. Mach can be abbreviated as Mach; for example, 1 mach can be written as 1 Mach.
When working with mach (Mach) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, mach (Mach) are widely used across standard speed applications within international standard workflows, engineering documentation, and technical data sheets.
What Is a Knot?
A knot is a unit of speed equal to 0.5144444 meters per second (m/s), the base unit for speed. One nautical mile per hour (1.852 km/h = 0.514444 m/s). [2]
The knot is classified as a standard unit of speed. Knots can be abbreviated as kn; for example, 1 knot can be written as 1 kn.
When working with knots (kn) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, knots (kn) are widely used across standard speed applications within international standard workflows, engineering documentation, and technical data sheets.
When converting speed between mach (Mach) and knots (kn), keep full floating-point precision (1 Mach = 661.4708423 kn; 1 kn = 0.0015118 Mach) during intermediate calculations and round only the final knot figure to match your instrument tolerance.
More Mach & Knot Conversions
Need to calculate in the opposite direction? Use our knots to mach calculator to switch your starting unit immediately. You can also explore related tools such as converting knots to mach, converting miles per hour to knots, or converting mach to kilometers per hour.
Convert from Mach
Frequently Asked Questions
References
- [1]NIST SP 811 StandardNIST SP 811 (NIST SP 811 App. B.9 (Velocity))·Speed Metrology Standard — Mach (Mach) to Knots (kn)
- [2]NIST OWM SpecificationNIST OWM (SI Units — Length & Distance)·Unit Specifications: Mach (SI Standard Sea Level) (Mach) & Knot (kn)
- [3]NIST CUU ReferenceNIST CUU (SI Coherent Derived Units (m/s))·Conversion Factors & Mathematical Basis (Mach to kn)