Convert speed units — km/h, mph, m/s, knots, mach and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 km/h | 0.000277778 m/s | |
| 0.01 km/h | 0.00277778 m/s | |
| 0.1 km/h | 0.0277778 m/s | |
| 1 km/h | 0.277778 m/s | |
| 5 km/h | 1.38889 m/s | |
| 10 km/h | 2.77778 m/s | |
| 50 km/h | 13.8889 m/s | |
| 100 km/h | 27.7778 m/s | |
| 1000 km/h | 277.778 m/s |
Common kilometer per hour values converted to meter per second — factor: 1 km/h = 0.2778 m/s
| Kilometer per Hour (km/h) | Meter per Second (m/s) | Context |
|---|---|---|
| 5 km/h | 1.389 m/s | Slow walk |
| 10 km/h | 2.778 m/s | Fast walk |
| 15 km/h | 4.167 m/s | Slow cycle |
| 30 km/h | 8.333 m/s | Fast cycle |
| 50 km/h | 13.89 m/s | City road |
| 60 km/h | 16.67 m/s | City road |
| 80 km/h | 22.22 m/s | Rural road |
| 100 km/h | 27.78 m/s | Motorway |
| 120 km/h | 33.33 m/s | Fast motorway |
| 140 km/h | 38.89 m/s | Fast motorway |
| 200 km/h | 55.56 m/s | Sports car |
| 300 km/h | 83.33 m/s | High-speed train |
| 500 km/h | 138.9 m/s | Propeller plane |
| 900 km/h | 250 m/s | Jet airliner |
| 1,235 km/h | 343.1 m/s | Speed of sound |
Converting kilometer per hour 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 km/h = 1.389 m/s and 10 km/h = 2.778 m/s. At higher speeds, 100 km/h = 27.78 m/s. For reverse conversion, multiply m/s values by 3.6 to get back to km/h.
All conversions use the internationally recognized factor of exactly 1 km/h = 0.2778 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 = Kilometer per Hour × 0.277778
Multiply any kilometer per hour value by 0.277778 to get meter per second. One kilometer per hour equals 0.277778 m/s.
Reverse: Kilometer per Hour = Meter per Second × 3.5999971
km/h ÷ 3.6 = m/s. This is exact: 1 km/h = 1000/3600 m/s = 1/3.6 m/s.
36 km/h = 10 m/s exactly. A very useful anchor for quick checks.
m/s × 3.6 = km/h.
Designs road speed limits, signage, and safety systems using km/h.
Monitors cornering speeds and stage times in km/h during competitions.
Reports wind speeds and storm movement in km/h for public advisories.
Designs track geometry and safety systems for trains running at 300+ km/h.
Measures athlete running, cycling, and swimming speeds in km/h.
Converts km/h speed limits when driving abroad in metric countries.
Kilometers per hour became the standard road speed unit when France adopted the metric system in the late 18th century. As the metric system spread globally through the 19th and 20th centuries, km/h became the dominant speed unit for road transport, aviation weather, and sports in most of the world.
Today, km/h appears on road signs, vehicle speedometers, and weather reports in over 160 countries. It is the official unit in the European Union, China, India, and most of Asia, Africa, and South America.
Interesting fact: Formula 1 cars reach over 350 km/h, and the land speed record stands at 1,228 km/h — set by the Thrust SSC in 1997, breaking the sound barrier on land.
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).