Meters per Second to Mach Converter
Enter a speed in meters per second and instantly get the equivalent Mach number based on the speed of sound at sea level (340.29 m/s).
Use the Meters per Second to Mach Converter
Speed to Mach Converter
Reverse: Mach → m/s
Reference Speeds
| Description | m/s | Mach |
|---|
Formula:
Mach = m/s ÷ 340.29
Reverse:
m/s = Mach × 340.29
Speed of sound at sea level, 15 °C (ISA standard).
Summary
Mach number is the ratio of an object's speed to the speed of sound in the surrounding medium. At sea level under standard atmosphere conditions (15 °C, 1 atm), the speed of sound is 340.29 m/s. This tool divides your m/s input by 340.29 to give the Mach number. Mach 1 is exactly the speed of sound; Mach 2 is twice that speed. Note that the speed of sound changes with altitude and temperature, so real-world aeronautical calculations use local conditions rather than the sea-level constant.
How it works
- Enter a speed in the m/s field.
- The tool divides the value by 340.29 (speed of sound at sea level, 15 °C).
- The Mach number result appears instantly.
- Use the reverse field to convert a Mach number back to m/s.
- Check the reference table for well-known speed benchmarks.
Use cases
- Determine whether an aircraft or projectile is subsonic, transonic, supersonic, or hypersonic.
- Convert wind-tunnel test speeds from m/s to Mach for reporting.
- Cross-check aerospace engineering calculations that mix SI and Mach notation.
- Estimate the Mach number of a bullet or rocket at a given speed.
- Teach or study the relationship between speed and the sound barrier.