Mach to m/s Converter

🔒 Runs in your browser — nothing is sent to a server

Convert Mach to meters per second, based on the sea-level standard 1 Mach = 343 m/s. Mach 0.85 = 291.55 m/s; Mach 2 = 686 m/s; Mach 5 = 1,715 m/s. Useful when an aircraft Mach number needs to feed into a physics calculation that requires SI velocity. Note: at cruise altitude (~11 km) actual speed of sound drops to about 295 m/s, making same-Mach speed about 14 % slower. Browser-local.

Mach (M)
Meter per second (m/s)

Mach (M) → Meter per second (m/s)

Quick reference table

Mach (M)Meter per second (m/s)
0.5 M171.5 m/s
1 M343 m/s
1.5 M514.5 m/s
2 M686 m/s
3 M1029 m/s
5 M1715 m/s
10 M3430 m/s

Glossary

Mach (M)

Mach is a ratio of object speed to the local speed of sound, named after physicist Ernst Mach. The actual speed of sound varies with air temperature and altitude. This converter uses the sea-level standard value 1 mach = 343 m/s (15 °C dry air, ICAO standard atmosphere). At cruise altitude (11 km, −56 °C) one mach is closer to 295 m/s — about 14 % slower.

Meter per second (m/s)

The meter per second is the SI derived unit of speed, defined as the distance of one meter travelled in one second. It is the standard unit in physics and engineering. Useful conversions: 1 m/s = 3.6 km/h = 2.2369 mph = 1.9438 knots. Wind speeds, projectile velocities and free-fall figures are typically reported in m/s in scientific contexts.

Metric / SI speed

In the metric system, speed is reported in meters per second (scientific) or kilometers per hour (everyday). The relation is exact: 1 m/s = 3.6 km/h. Most countries use km/h on road signs and speedometers; m/s appears in physics, engineering, weather data and athletics where fine-resolution timing matters.

Imperial / US Customary speed

In the United States, the United Kingdom and a few other countries, road speeds are reported in miles per hour (mph). US engineering also uses feet per second (ft/s). 1 mph = 1.6093 km/h = 0.4470 m/s. Maritime and aviation worldwide use knots (1 knot = 1.852 km/h), independent of the metric/imperial divide.

Related tools

m/s to Mach
Convert m/s to Mach — 343 m/s = 1 Mach (sea-level)
Mach to km/h
Convert Mach to km/h — 1 Mach ≈ 1234.8 km/h (sea-level)
Mach to mph
Convert Mach to mph — 1 Mach ≈ 767.27 mph (sea-level)
Speed Converter
Convert speed — m/s, km/h, mph, knots, ft/s, mach