Kilometers per Hour to Kilometers per Second
Convert kilometers per hour to kilometers per second instantly. 1 km/h = 0.0002777778 km/s. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert kilometers per hour to kilometers per second
To convert kilometers per hour to kilometers per second, divide by 3,600 (multiply by 0.0002777778). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
km/s = km/h × 0.0002777778
Kilometers per Hour to Kilometers per Second conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Kilometers per Hour | Kilometers per Second |
|---|---|
| 1 km/h | 0.0002778 km/s |
| 2 km/h | 0.0005556 km/s |
| 3 km/h | 0.0008333 km/s |
| 5 km/h | 0.001389 km/s |
| 10 km/h | 0.002778 km/s |
| 20 km/h | 0.005556 km/s |
| 25 km/h | 0.006944 km/s |
| 50 km/h | 0.013889 km/s |
| 100 km/h | 0.027778 km/s |
| 500 km/h | 0.138889 km/s |
| 1,000 km/h | 0.277778 km/s |
What is a kilometers per hour?
The road-speed unit almost everywhere outside the US and UK.
What is a kilometers per second?
The scale of orbital and escape velocities.
The formula
km/s = km/h × 0.0002777778
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Kilometers per Hour to Kilometers per Second
- Type the number of kilometers per hour you want to convert.
- Read the result in kilometers per second straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked kilometers per second to kilometers per hour page.
Kilometers per Hour to Kilometers per Second — frequently asked questions
How many kilometers per second are in a kilometers per hour?
One kilometers per hour equals 0.0002777778 km/s. km/s = km/h × 0.0002777778
What is the formula to convert kilometers per hour to kilometers per second?
The formula is km/s = km/h × 0.0002777778. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert kilometers per second back to kilometers per hour?
Divide instead of multiplying: one kilometers per second is 3,600 km/h. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this kilometers per hour to kilometers per second free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the kilometers per hour to kilometers per second.
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error