Distance divided by time.
Millimeter per Hours to m/s Converter — mm/h to m/s
Convert Millimeter per Hours (mm/h) to m/s (m/s) using the exact conversion factor (1 millimeter per hours = 2.777778e-7 m/s). See the formula, worked examples, conversion table, history, and common uses.
Millimeter per Hours to m/s 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.
Meters per second.
Result = input x 2.77777778e-7 / 1.
Speed uses meters per second as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Millimeter per Hours to m/s
Millimeter per Hours and m/s both describe speed, and the conversion matters whenever a maritime or aviation speed (knots) needs to be compared against a road speed (mph). Specifically: Distance divided by time, and meters per second.
Formula
m/s = millimeter per hours × 2.777778e-7
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 m/s equals 1 base unit, so dividing one by the other gives the direct millimeter per hours-to-m/s factor of 2.777778e-7.
Simple example
1 mm/h × 2.777778e-7 = 2.777778e-7 m/s
1 millimeter per hours = 2.777778e-7 m/s.
Real-world example
10 mm/h × 2.777778e-7 = 0.0000027778 m/s
10 millimeter per hours = 0.0000027778 m/s.
Conversion table
| Millimeter per Hours (mm/h) | m/s (m/s) |
|---|---|
| 1 mm/h | 2.777778e-7 m/s |
| 5 mm/h | 0.0000013889 m/s |
| 10 mm/h | 0.0000027778 m/s |
| 25 mm/h | 0.0000069444 m/s |
| 50 mm/h | 0.0000138889 m/s |
| 100 mm/h | 0.0000277778 m/s |
Reverse conversion: m/s to Millimeter per Hours
2.777778e-7 m/s × 3600000 = 1.00000008 mm/h
2.777778e-7 m/s = 1.00000008 millimeter per hours.
millimeter per hours = m/s × 3600000
For a page dedicated to this direction, see m/s to Millimeter per Hours.
Understanding the Millimeter per Hours (mm/h)
Distance divided by time.
Understanding the m/s
m/s (m/s) measures speed. The meter per second is the SI derived unit of speed: one meter of distance per second of time. It is classified as a SI derived unit.
Where it's used: Standard scientific speed unit worldwide
Uses of the m/s today
- Scientific and engineering speed/velocity calculations
- Meteorology (wind speed, alongside km/h and knots)
- Physics education and calculations
History of the m/s
As a coherent SI derived unit, meters per second follows automatically from the meter and second, the SI base units of length and time, without an independent historical origin.
Historical origin. m/s was not the invention of a single named person; it developed through the process described above.
m/s — sources
- BIPM SI Brochure — Coherent derived units — Defines m/s as the SI unit of speed.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many m/s are in 1 millimeter per hours?
1 millimeter per hours equals 2.777778e-7 m/s, using the exact defined conversion factor rather than an estimate.
How do I convert millimeter per hours to m/s?
Multiply the millimeter per hours value by 2.777778e-7. The converter above does this instantly to whatever precision you set.
How do I convert m/s back to millimeter per hours?
Use the reverse factor: 1 m/s equals 3,600,000 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 m/s?
m/s (m/s) measures speed. The meter per second is the SI derived unit of speed: one meter of distance per second of time. It is classified as a SI derived unit.
Is the millimeter per hours to m/s conversion exact?
Yes. Both millimeter per hours and m/s are defined by fixed standards rather than physical artifacts, so the factor of 2.777778e-7 used above is exact to as many digits as you choose to display.