Kilometers per Second to Kilometers per Hour Converter
Enter the speed in kilometers per second below to convert it to kilometers per hour.
Convert Kilometers per Second to Kilometers per Hour
Enter a value in kilometers per second (km/s) to convert to kilometers per hour (km/h).
Kilometers per Second to Kilometers per Hour Conversion Table
Table showing various kilometers per second measurements converted to kilometers per hour. Click any preset value or arrow to load it into the converter.
| Kilometers per Second (km/s) | Kilometers per Hour (km/h) |
|---|---|
| 1 km/s | 3,600 km/h |
| 2 km/s | 7,200 km/h |
| 2.5 km/s | 9,000 km/h |
| 5 km/s | 18,000 km/h |
| 10 km/s | 36,000 km/h |
| 15 km/s | 54,000 km/h |
| 20 km/s | 72,000 km/h |
| 25 km/s | 90,000 km/h |
| 30 km/s | 108,000 km/h |
| 50 km/s | 180,000 km/h |
How to Convert Kilometers per Second to Kilometers per Hour
To convert kilometers per second to kilometers per hour, multiply the speed by the following conversion ratio: 3,600 kilometers per hour/kilometers per second.
Since one kilometers per second is equal to 3,600 kilometers per hour, you can use this simple formula to convert:
The speed in kilometers per hour is equal to the speed in kilometers per second multiplied by 3,600.
For example, here's how to convert 5 kilometers per second to kilometers per hour using the formula above.
How Many Kilometers per Hour Are in a Kilometers per Second?
There are 3,600 kilometers per hour in a kilometers per second, which is why we use this value in the formula above.
Our kilometers per second to kilometers per hour calculator automatically converts your speed measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Kilometers per Second and kilometers per hour are both units used to measure speed. Keep reading to learn more about each unit.
What Is a Kilometers per Second?
A kilometers per second is a unit of speed equal to 1,000 meters per second (m/s), the base unit for speed. Astrophysics & orbital velocity unit equal to 1,000 m/s. [1]
The kilometers per second is classified as an International System of Units (SI) unit of speed. Kilometers per Second can be abbreviated as km/s; for example, 1 kilometers per second can be written as 1 km/s.
In the metric system, "kilo" is the standard SI prefix for thousands, or 10³. This makes the kilometers per second (km/s) a convenient decimal multiple of the meters per second (m/s).
In practice, kilometers per second (km/s) are widely used across large-scale industrial, bulk, and macro-level speed specifications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
What Is a Kilometers per Hour?
A kilometers per hour is a unit of speed equal to 0.2777778 meters per second (m/s), the base unit for speed. Standard metric road speed unit (1 m/s = 3.6 km/h). [2]
The kilometers per hour is classified as a metric and SI-compatible unit of speed. Kilometers per Hour can be abbreviated as km/h; for example, 1 kilometers per hour can be written as 1 km/h.
In the metric system, "kilo" is the standard SI prefix for thousands, or 10³. This makes the kilometers per hour (km/h) a convenient decimal multiple of the meters per second (m/s).
In practice, kilometers per hour (km/h) are widely used across standard speed applications within SI metric workflows, engineering documentation, and technical data sheets.
When converting speed between kilometers per second (km/s) and kilometers per hour (km/h), keep full floating-point precision (1 km/s = 3,600 km/h; 1 km/h = 0.000277778 km/s) during intermediate calculations and round only the final kilometers per hour figure to match your instrument tolerance.
More Kilometers per Second & Kilometers per Hour Conversions
Need to calculate in the opposite direction? Use our kilometers per hour to kilometers per second calculator to switch your starting unit immediately. You can also explore related tools such as converting kilometers per hour to kilometers per second, converting miles per hour to kilometers per hour, or converting meters per second to kilometers per hour.
Convert from Kilometers per Second
Frequently Asked Questions
References
- [1]NIST SP 811 StandardNIST SP 811 (NIST SP 811 App. B.9 (Velocity))·Speed Metrology Standard — Kilometers per Second (km/s) to Kilometers per Hour (km/h)
- [2]NIST OWM SpecificationNIST OWM (SI Units — Length & Distance)·Unit Specifications: Kilometers per Second (km/s) & Kilometers per Hour (km/h)
- [3]NIST CUU ReferenceNIST CUU (SI Coherent Derived Units (m/s))·Conversion Factors & Mathematical Basis (km/s to km/h)