Convert speed units — km/h, mph, m/s, knots, mach and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 km/h | 0.0277778 cm/s | |
| 0.01 km/h | 0.277778 cm/s | |
| 0.1 km/h | 2.77778 cm/s | |
| 1 km/h | 27.7778 cm/s | |
| 5 km/h | 138.889 cm/s | |
| 10 km/h | 277.778 cm/s | |
| 50 km/h | 1388.89 cm/s | |
| 100 km/h | 2777.78 cm/s | |
| 1000 km/h | 27777.8 cm/s |
Common kilometer per hour values converted to centimeter per second — factor: 1 km/h = 27.78 cm/s
| Kilometer per Hour (km/h) | Centimeter per Second (cm/s) | Context |
|---|---|---|
| 5 km/h | 138.9 cm/s | Slow walk |
| 10 km/h | 277.8 cm/s | Fast walk |
| 15 km/h | 416.7 cm/s | Slow cycle |
| 30 km/h | 833.3 cm/s | Fast cycle |
| 50 km/h | 1,389 cm/s | City road |
| 60 km/h | 1,667 cm/s | City road |
| 80 km/h | 2,222 cm/s | Rural road |
| 100 km/h | 2,778 cm/s | Motorway |
| 120 km/h | 3,333 cm/s | Fast motorway |
| 140 km/h | 3,889 cm/s | Fast motorway |
| 200 km/h | 5,556 cm/s | Sports car |
| 300 km/h | 8,333 cm/s | High-speed train |
| 500 km/h | 1.389e+04 cm/s | Propeller plane |
| 900 km/h | 2.5e+04 cm/s | Jet airliner |
| 1,235 km/h | 3.431e+04 cm/s | Speed of sound |
Converting kilometer per hour to centimeter 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 = 138.9 cm/s and 10 km/h = 277.8 cm/s. At higher speeds, 100 km/h = 2778 cm/s. For reverse conversion, multiply cm/s values by 0.036 to get back to km/h.
All conversions use the internationally recognized factor of exactly 1 km/h = 27.78 cm/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: Centimeter per Second = Kilometer per Hour × 27.7778
Multiply any kilometer per hour value by 27.7778 to get centimeter per second. One kilometer per hour equals 27.7778 cm/s.
Reverse: Kilometer per Hour = Centimeter per Second × 0.035999971
km/h ÷ 0.036 = cm/s.
One km/h = 27.78 cm/s — chain: km/h ÷ 3.6 = m/s, × 100 = cm/s.
cm/s × 0.036 = 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.
Centimeters per second is a CGS (centimeter-gram-second) unit of speed equal to 0.01 m/s. It was part of the CGS system formalized by the British Association for the Advancement of Science in 1874.
cm/s is used in microfluidics, laboratory experiments, slow fluid flows, and medical imaging (e.g., blood flow velocity in capillaries). It provides convenient numbers where m/s would give tiny decimals.
Interesting fact: Blood flow in capillaries is typically 0.03-0.05 cm/s, while ocean currents range from 5-25 cm/s. A garden snail moves at about 0.03 cm/s.