Kilometer per Hour to Kilometer per Second Conversion
Convert between Kilometer per Hour and Kilometer per Second quickly and accurately.
How to Convert Kilometer per Hour to Kilometer per Second
Conversion Formula
Example
Convert 15 km/h to km/s:
Unit Information
Learn about the speed units you're converting between
Kilometer per Hour
km/h
Definition
The kilometer per hour is a unit of speed expressing the number of kilometers traveled in one hour. It is commonly used for measuring vehicle speeds, wind speeds, and general transportation velocities in most countries worldwide, except the United States.
History/Origin
Kilometer per hour became widely adopted with the metric system in the 19th century, particularly in Europe and other metric countries. It replaced various regional speed measurements and became the standard for road signs, speedometers, and official speed limits.
Current Use
Kilometer per hour is the primary speed unit for road traffic, aviation, maritime navigation, and weather reporting in metric countries. It is used on speedometers, road signs, weather forecasts, and in transportation planning and safety regulations.
Multiplier
0.278
Offset
0
Kilometer per Second
km/s
Definition
The kilometer per second is a unit of speed representing the distance of one kilometer traveled in one second. It is used for measuring extremely high speeds such as those of spacecraft, projectiles, or other high-velocity objects in physics and engineering.
History/Origin
Kilometer per second was developed for measuring extremely high velocities in physics, astronomy, and aerospace engineering. It became essential for expressing speeds of spacecraft, satellites, and other high-velocity objects in space exploration.
Current Use
Kilometer per second is used in aerospace engineering for spacecraft velocities, in physics for high-speed particle studies, in astronomy for celestial object speeds, and in military applications for projectile velocities.
Multiplier
1000
Offset
0
Kilometer per Hour to Kilometer per Second Conversion Table
| Kilometer per Hour [km/h] | Kilometer per Second [km/s] |
|---|---|
| 1 km/h | 0.000278 km/s |
| 10 km/h | 0.002778 km/s |
| 25 km/h | 0.006944 km/s |
| 50 km/h | 0.013889 km/s |
| 100 km/h | 0.027778 km/s |
| 0 km/h | 0E+0 km/s |
| -10 km/h | -0.002778 km/s |
| -40 km/h | -0.011111 km/s |
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