How to convert kilometers per hour to kilometers per second
km/s = km/h × 0.0002777777778Because one kilometer per second equals 3,600 kilometers per hour, you can also divide: km/s = km/h ÷ 3,600.
A kilometer per hour is smaller than a kilometer per second: it takes 3,600 kilometers per hour to make one kilometer per second.
Worked examples
- 1 kilometer per hour1 km/h × 0.0002777777778 = 0.0002777777778 km/s
- 5 kilometers per hour5 km/h × 0.0002777777778 = 0.001388888889 km/s
- 10 kilometers per hour10 km/h × 0.0002777777778 = 0.002777777778 km/s
- 20 kilometers per hour20 km/h × 0.0002777777778 = 0.005555555556 km/s
- 100 kilometers per hour100 km/h × 0.0002777777778 = 0.02777777778 km/s
Kilometers per hour to kilometers per second conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Kilometers per hour (km/h) | Kilometers per second (km/s) |
|---|---|
| 0.1 km/h | 0.000027777778 km/s |
| 0.25 km/h | 0.000069444444 km/s |
| 0.5 km/h | 0.00013888889 km/s |
| 1 km/h | 0.00027777778 km/s |
| 2 km/h | 0.00055555556 km/s |
| 3 km/h | 0.00083333333 km/s |
| 4 km/h | 0.0011111111 km/s |
| 5 km/h | 0.0013888889 km/s |
| 6 km/h | 0.0016666667 km/s |
| 7 km/h | 0.0019444444 km/s |
| 8 km/h | 0.0022222222 km/s |
| 9 km/h | 0.0025 km/s |
| 10 km/h | 0.0027777778 km/s |
| Kilometers per hour (km/h) | Kilometers per second (km/s) |
|---|---|
| 12 km/h | 0.0033333333 km/s |
| 15 km/h | 0.0041666667 km/s |
| 20 km/h | 0.0055555556 km/s |
| 25 km/h | 0.0069444444 km/s |
| 30 km/h | 0.0083333333 km/s |
| 40 km/h | 0.011111111 km/s |
| 50 km/h | 0.013888889 km/s |
| 75 km/h | 0.020833333 km/s |
| 100 km/h | 0.027777778 km/s |
| 250 km/h | 0.069444444 km/s |
| 500 km/h | 0.13888889 km/s |
| 1,000 km/h | 0.27777778 km/s |
About the units
Kilometer per hour (km/h)
The road-speed unit in most of the world. Divide by 3.6 for m/s; 100 km/h is about 62 mph. One kilometer per hour equals 0.2777777778 meters per second (m/s).
Kilometer per second (km/s)
The kilometer per second (km/s) is a unit of speed in the International System of Units (SI). One kilometer per second equals 1,000 meters per second (m/s).
Frequently asked questions
How many kilometers per second are in one kilometer per hour?
There are 0.0002777777778 kilometers per second in one kilometer per hour, and this value is exact by definition.
How do I convert kilometers per hour to kilometers per second?
Multiply the number of kilometers per hour by 0.0002777777778. For example, 10 km/h × 0.0002777777778 = 0.002777777778 km/s.
How many kilometers per hour are in one kilometer per second?
One kilometer per second equals 3,600 kilometers per hour. That is the reverse factor, 1 ÷ 0.0002777777778.
What is 10 kilometers per hour in kilometers per second?
10 km/h = 0.002777777778 km/s.
Is this km/h to km/s converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.
Convert kilometers per hour to other units
- Kilometers per hour to miles per hour
- Kilometers per hour to meters per second
- Kilometers per hour to knots
- Kilometers per hour to feet per second
- Kilometers per hour to Mach