Mach to Meters per Second Converter
Convert Mach number to meters per second at sea level and 15 °C. Results update as you type; exact factors shown.
One Mach (sea level, 15 °C) is 340.29 meter per second — see the exact factor, not a rounded rule of thumb.
How the mach to meters per second converter works
Speeds convert through meters per second. 1 km/h is 1000/3600 m/s; 1 mph is 1609.344/3600 m/s; a knot is one nautical mile (1,852 m) per hour. Mach is shown against the standard sea-level speed of sound of 340.29 m/s and varies with altitude and temperature.
The US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
Common speed conversions
| From | To | Units |
|---|---|---|
| 0.1 Ma | 34.029 m/s | Mach (sea level, 15 °C) to meter per second |
| 0.25 Ma | 85.0725 m/s | Mach (sea level, 15 °C) to meter per second |
| 0.5 Ma | 170.145 m/s | Mach (sea level, 15 °C) to meter per second |
| 0.8 Ma | 272.232 m/s | Mach (sea level, 15 °C) to meter per second |
| 0.85 Ma | 289.2465 m/s | Mach (sea level, 15 °C) to meter per second |
| 1 Ma | 340.29 m/s | Mach (sea level, 15 °C) to meter per second |
| 1.5 Ma | 510.435 m/s | Mach (sea level, 15 °C) to meter per second |
| 2 Ma | 680.58 m/s | Mach (sea level, 15 °C) to meter per second |
| 2.5 Ma | 850.725 m/s | Mach (sea level, 15 °C) to meter per second |
| 3 Ma | 1,020.87 m/s | Mach (sea level, 15 °C) to meter per second |
| 5 Ma | 1,701.45 m/s | Mach (sea level, 15 °C) to meter per second |
| 10 Ma | 3,402.9 m/s | Mach (sea level, 15 °C) to meter per second |
Units in this converter and their exact factors
| Unit | Symbol | One unit in meter per seconds |
|---|---|---|
| meter per second | m/s | 1 meter per second |
| kilometer per hour | km/h | 0.2777777778 meter per second |
| mile per hour | mph | 0.44704 meter per second |
| knot | kn | 0.5144444444 meter per second |
| foot per second | ft/s | 0.3048 meter per second |
| Mach (sea level, 15 °C) | Ma | 340.29 meter per second |
FAQFrequently asked questions about speed conversion
What is Mach 1 in m/s?
340.29 m/s at sea level and 15 °C.
Does it change with altitude?
Yes — the speed of sound tracks air temperature, so at cruise altitude Mach 1 is about 295 m/s.
What is Mach 2?
680.6 m/s at sea level.
Why does temperature matter and not pressure?
Because the speed of sound depends on the square root of absolute temperature, and pressure cancels out for an ideal gas.
What is a hypersonic speed?
Mach 5 and above — over 1,700 m/s at sea level.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.