Convert speed units — km/h, mph, m/s, knots, Mach.
| Unit | Name | Value |
|---|---|---|
| m/s | Meter per Second | 340.29 |
| km/h | Kilometer per Hour | 1225.043 |
| mph | Mile per Hour | 761.20705 |
| ft/s | Foot per Second | 1116.437 |
| kn | Knot | 661.47141 |
Common mach values converted to meter per second — factor: 1 mach = 340.3 m/s
| Mach (mach) | Meter per Second (m/s) | Context |
|---|---|---|
| 0.1 mach | 34.03 m/s | Slow aircraft |
| 0.3 mach | 102.1 m/s | Small plane |
| 0.5 mach | 170.2 m/s | Turboprop |
| 0.75 mach | 255.2 m/s | Fast prop |
| 0.85 mach | 289.3 m/s | Airliner cruise |
| 0.9 mach | 306.3 m/s | Fast airliner |
| 1 mach | 340.3 m/s | Speed of sound |
| 1.5 mach | 510.5 m/s | Supersonic |
| 2 mach | 680.6 m/s | Concorde speed |
| 2.5 mach | 850.8 m/s | Fast supersonic |
| 3 mach | 1,021 m/s | SR-71 fraction |
| 5 mach | 1,702 m/s | Hypersonic |
| 10 mach | 3,403 m/s | High hypersonic |
| 20 mach | 6,806 m/s | Low orbit |
| 25 mach | 8,508 m/s | Space shuttle entry |
Converting mach to meter per second is essential for drivers, pilots, engineers, and scientists working across different measurement systems. Road speed limits, aviation airspeed, nautical navigation, and physics calculations each use different speed units, making quick and accurate conversion a practical everyday skill.
Key reference points: 5 mach = 1702 m/s and 10 mach = 3403 m/s. At higher speeds, 100 mach = 3.403e+04 m/s. For reverse conversion, multiply m/s values by 0.002939 to get back to mach.
All conversions use the internationally recognized factor of exactly 1 mach = 340.3 m/s. Calculations are performed in IEEE 754 double-precision floating point, giving accuracy to at least 8 significant figures — more than sufficient for any practical application.
Formula: Meter per Second = Mach × 340.3
Multiply any mach value by 340.3 to get meter per second. One mach equals 340.3 m/s.
Reverse: Mach = Meter per Second × 0.0029385836
Mach × 343 = m/s (at sea level, 20°C).
One Mach = 343 m/s at standard sea-level conditions.
m/s ÷ 343 = Mach.
Designs supersonic and hypersonic aircraft for specific Mach regimes.
Reports aircraft performance and structural limits in Mach number.
Evaluates missile and aircraft performance using Mach speed ratings.
Calculates re-entry heating and trajectory at high Mach numbers.
Reports fighter jet and experimental aircraft speeds in Mach.
Teaches compressible flow and shock wave theory using Mach numbers.
Mach number was named after Austrian physicist Ernst Mach (1838-1916), who studied the properties of supersonic flow. It represents the ratio of an object's speed to the local speed of sound.
Mach is used in aviation and aerospace to describe speeds relative to sound: Mach 1 is the sound barrier (~340 m/s at sea level), Mach 2 is twice that. Commercial aircraft cruise at Mach 0.85, while fighter jets reach Mach 2+.
Interesting fact: The SR-71 Blackbird held the air speed record at Mach 3.3 (3,530 km/h). The Space Shuttle re-entered the atmosphere at Mach 25, and the Parker Solar Probe reached Mach 163.
Meters per second is the SI derived unit of speed, defined as one meter of distance traveled per second. It was established when the metric system was codified by France in 1795 and became the scientific standard worldwide.
m/s is the preferred unit in physics, engineering, and scientific research. Wind speeds in meteorology, projectile velocities in ballistics, and fluid flow rates in engineering are all measured in m/s.
Interesting fact: The speed of sound in air at 20°C is approximately 343 m/s. A typical sneeze travels at about 4.5 m/s, while a cheetah can reach 28 m/s (100 km/h).