Convert kilometre per hour to metre per second
1 kilometre per hour = 0.27777778 metres per second
What is kilometre per hour?
Kilometre per hour is a unit of speed equal to one kilometre travelled in one hour. It is the most widely used unit for road speed limits, vehicle speedometers, and wind speeds in metric countries.
Real-world uses
Kilometres per hour is the standard speed unit for road traffic in most countries, displayed on car speedometers, speed limit signs, and GPS devices. Weather services report wind speeds in km/h, and athletes track running pace in min/km.
History
Kilometres per hour became widespread as the metric system was adopted for road transport in the 20th century. The first metric speed limits appeared in continental Europe. Today, km/h is used in about 91% of the world's countries for traffic regulation.
Common mistakes
Confusing km/h with m/s—100 km/h is about 27.78 m/s, not 100 m/s. Also, when converting to mph, people often use a rough factor of 1.5 instead of the correct 1.609, leading to inaccurate speed comparisons.
What is metre per second?
Metre per second is the SI unit of speed. It is used in physics, engineering, and scientific contexts to express velocity, and serves as the reference unit for all speed calculations in this converter.
Real-world uses
Metres per second is the SI unit of speed used in physics, engineering, and scientific research. Wind speed in meteorological data, projectile velocities, and fluid flow rates are expressed in m/s. The speed of sound at sea level is approximately 343 m/s.
History
As an SI derived unit, metres per second became the standard scientific speed unit with the adoption of the SI system in 1960. It naturally combines the base units of length (metre) and time (second).
Common mistakes
Forgetting to convert from km/h—divide by 3.6, not by 3.0 or 60. Also, confusing velocity (vector with direction) with speed (scalar magnitude), both expressed in m/s but with different physical meanings.
When is this conversion used?
Speed limits, vehicle speedometers, and weather reports for wind speeds use different units depending on the country, making km/h to mph conversion one of the most practical speed conversions.
Worked examples
1 kilometre per hour = 0.27777778 metres per second
1 metre per second = 1 metre per second
How to convert kilometre per hour to metre per second
To convert kilometre per hour to metre per second, multiply the value by 0.27777778.
To convert metre per second back to kilometre per hour, multiply by 3.6.
Measurement standards
The SI unit of speed is metres per second (m/s), a derived unit requiring no independent definition. The knot is defined as exactly one nautical mile (1,852 metres) per hour and is sanctioned for maritime and aeronautical navigation by the International Civil Aviation Organization.
Did you know?
The fastest human-made object is the Parker Solar Probe, which reached 635,266 km/h (about 176 km/s) in 2024 during a close pass of the Sun — fast enough to travel from New York to Tokyo in under a minute.
| kilometres per hour | metres per second |
|---|---|
| 0.1 | 0.02777778 |
| 0.5 | 0.13888889 |
| 1 | 0.27777778 |
| 2 | 0.55555556 |
| 5 | 1.38888889 |
| 10 | 2.77777778 |
| 25 | 6.94444445 |
| 50 | 13.88888889 |
| 100 | 27.77777778 |
| 250 | 69.44444445 |
| 500 | 138.8888889 |
| 1,000 | 277.7777778 |
Common values
| kilometres per hour | metres per second | |
|---|---|---|
| Walking speed | 5.04 kilometres per hour | 1.4 metres per second |
| City speed limit | 50.04 kilometres per hour | 13.9 metres per second |
| Highway driving | 112.67999999 kilometres per hour | 31.3 metres per second |
| Commercial aircraft | 899.99999993 kilometres per hour | 250 metres per second |
| Speed of sound (sea level) | 1,225.0439999 kilometres per hour | 340.29 metres per second |
Frequently asked questions
How many metres per second are in 1 kilometre per hour?
1 kilometre per hour = 0.27777778 metres per second.
How do you convert kilometre per hour to metre per second?
Multiply the kilometre per hour value by 0.27777778 to get metre per second.
What is 10 kilometres per hour in metres per second?
10 kilometres per hour = 2.77777778 metres per second.
How many kilometres per hour are in 1 metre per second?
1 metre per second = 3.6 kilometres per hour.
Available Speed units
More kilometre per hour conversions
- Convert kilometre per hour to metre per second
- Convert kilometre per hour to mile per hour
- Convert kilometre per hour to knot
- Convert kilometre per hour to foot per second
- Convert kilometre per hour to metre per minute
- Convert kilometre per hour to kilometre per second
- Convert kilometre per hour to mach (approx at sea level)
- Convert kilometre per hour to centimetre per second
- Convert kilometre per hour to mile per minute
Assumption: Mach uses an approximate sea-level reference (about 340.29 m/s).