Mach to mph Converter

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

Convert Mach to miles per hour, based on the sea-level standard speed of sound 1 Mach ≈ 767.27 mph. Mach 0.85 (airliner cruise) ≈ 652.18 mph; Mach 2 (Concorde-class) ≈ 1,534.54 mph; Mach 5 (hypersonic) ≈ 3,836.36 mph. Note that actual speed of sound at cruise altitude is about 14 % lower than the sea-level value. Browser-local conversion.

Mach (M)
Mile per hour (mph)

Mach (M) → Mile per hour (mph)

Quick reference table

Mach (M)Mile per hour (mph)
0.5 M383.6346 mph
1 M767.2691 mph
1.5 M1150.9037 mph
2 M1534.5383 mph
3 M2301.8074 mph
5 M3836.3457 mph
10 M7672.6915 mph

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.

Mile per hour (mph)

A mile per hour is the customary speed unit used in the United States, the United Kingdom and a few other countries for road traffic, athletic events and weather reports. 1 mph = 1.6093 km/h = 0.4470 m/s. Typical US highway limits are 55–75 mph; a 100 m sprinter peaks at about 27 mph; a hurricane is sustained winds above 74 mph.

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

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