Distance divided by time.
Millimeter per Hours to Kilometer per Seconds Converter — mm/h to km/s
Convert Millimeter per Hours (mm/h) to Kilometer per Seconds (km/s) using the exact conversion factor (1 millimeter per hours = 2.777778e-10 kilometer per seconds). See the formula, worked examples, and conversion table.
Millimeter per Hours to Kilometer per Seconds converter
Converter
Speed Converter
Convert road, aviation, marine, lab, and scientific speed units.
Context values
Some unit families need one extra value for a physically accurate result.
Distance divided by time.
Result = input x 2.77777778e-7 / 1000.
Speed uses meters per second as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Millimeter per Hours to Kilometer per Seconds
Millimeter per Hours and Kilometer per Seconds both describe speed, and the conversion matters whenever a maritime or aviation speed (knots) needs to be compared against a road speed (mph). Both are distance divided by time units.
Formula
kilometer per seconds = millimeter per hours × 2.777778e-10
This factor comes from each unit's defined relationship to the category's base unit: 1 millimeter per hours equals 2.777778e-7 base units, and 1 kilometer per seconds equals 1000 base units, so dividing one by the other gives the direct millimeter per hours-to-kilometer per seconds factor of 2.777778e-10.
Simple example
1 mm/h × 2.777778e-10 = 2.777778e-10 km/s
1 millimeter per hours = 2.777778e-10 kilometer per seconds.
Real-world example
10 mm/h × 2.777778e-10 = 2.777778e-9 km/s
10 millimeter per hours = 2.777778e-9 kilometer per seconds.
Conversion table
| Millimeter per Hours (mm/h) | Kilometer per Seconds (km/s) |
|---|---|
| 1 mm/h | 2.777778e-10 km/s |
| 5 mm/h | 1.388889e-9 km/s |
| 10 mm/h | 2.777778e-9 km/s |
| 25 mm/h | 6.944444e-9 km/s |
| 50 mm/h | 1.388889e-8 km/s |
| 100 mm/h | 2.777778e-8 km/s |
Reverse conversion: Kilometer per Seconds to Millimeter per Hours
2.777778e-10 km/s × 3600000000 = 1.00000008 mm/h
2.777778e-10 kilometer per seconds = 1.00000008 millimeter per hours.
millimeter per hours = kilometer per seconds × 3600000000
For a page dedicated to this direction, see Kilometer per Seconds to Millimeter per Hours.
Understanding the Millimeter per Hours (mm/h)
Distance divided by time.
Understanding the Kilometer per Seconds (km/s)
Distance divided by time.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many kilometer per seconds are in 1 millimeter per hours?
1 millimeter per hours equals 2.777778e-10 kilometer per seconds, using the exact defined conversion factor rather than an estimate.
How do I convert millimeter per hours to kilometer per seconds?
Multiply the millimeter per hours value by 2.777778e-10. The converter above does this instantly to whatever precision you set.
How do I convert kilometer per seconds back to millimeter per hours?
Use the reverse factor: 1 kilometer per seconds equals 3,600,000,000 millimeter per hours. You can also use the swap control in the converter above to flip the direction instantly.
What is a millimeter per hours?
Millimeter per Hours (mm/h) is a unit of speed.
What is a kilometer per seconds?
Kilometer per Seconds (km/s) is a unit of speed.
Is the millimeter per hours to kilometer per seconds conversion exact?
Yes. Both millimeter per hours and kilometer per seconds are defined by fixed standards rather than physical artifacts, so the factor of 2.777778e-10 used above is exact to as many digits as you choose to display.