Millimetres per Hour to Metres per Second (mm/h to m/s)
1 millimetre per hour (mm/h) = 2.777777778 × 10⁻⁷ metres per second (m/s). 1 m/s = 3600000 mm/h. Example: 15 mm/h = 15 × 2.777777778 × 10⁻⁷ = 0.000004166666667 m/s.
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1 mm/h = 2.777777778e-7 m/s
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millimetre per hour to metre per second converter to paste a column from Excel.
How to Convert Millimetre per Hour to Metre per Second
- 1 mm/h = 2.777777778 × 10⁻⁷ m/s
- 1 m/s = 3600000 mm/h
- Example: convert 15 mm/h to m/s: 15 mm/h = 15 × 2.777777778 × 10⁻⁷ m/s = 0.000004166666667 m/s
Formula
m/s = mm/h ÷ 3600000
Derivation from SI units:
- 1 mm/h = 0.001/3600 m/s.
- Hydraulic conductivity K = discharge per unit area per unit hydraulic gradient, in m/s.
Both units are defined exactly, so the factor is exact. Millimetre per Hour definition: millimetre per hour; Metre per Second definition: metre per second.
Worked examples
- A reading of 10 mm/h converts to 0.000002777777778 m/s.
10 mm/h × 2.777777778 × 10⁻⁷ = 0.000002777777778 m/s - A value of 50 mm/h is 0.00001388888889 m/s.
50 mm/h × 2.777777778 × 10⁻⁷ = 0.00001388888889 m/s
Millimetre per Hour to Metre per Second conversion table
| Millimetres per Hour (mm/h) | Metres per Second (m/s) |
|---|---|
| 1 mm/h | 2.777777778 × 10⁻⁷ m/s |
| 2 mm/h | 5.555555556 × 10⁻⁷ m/s |
| 5 mm/h | 0.000001388888889 m/s |
| 10 mm/h | 0.000002777777778 m/s |
| 15 mm/h | 0.000004166666667 m/s |
| 25 mm/h | 0.000006944444444 m/s |
| 50 mm/h | 0.00001388888889 m/s |
| 75 mm/h | 0.00002083333333 m/s |
| 100 mm/h | 0.00002777777778 m/s |
| 150 mm/h | 0.00004166666667 m/s |
Where it's used
Millimetres per Hour are used for sprinkler application rate versus infiltration, while metres per second appear in darcy’s law and seepage analysis. Both measure hydraulic conductivity (coefficient of permeability k), so the conversion is a fixed factor.
Millimetre per Hour to other hydraulic conductivity units
| Conversion | 1 mm/h equals |
|---|---|
| millimetre per hour to metre per second | 2.777777778 × 10⁻⁷ m/s |
| millimetre per hour to centimetre per second | 0.00002777777778 cm/s |
| millimetre per hour to metre per day | 0.024 m/day |
| millimetre per hour to centimetre per hour | 0.1 cm/h |
| millimetre per hour to foot per day | 0.07874015748 ft/day |
| millimetre per hour to inch per hour | 0.03937007874 in/h |
| millimetre per hour to gpd/ft² | 0.5890172819 gpd/ft² |
Frequently asked questions
How many metres per second are in 1 millimetre per hour?
1 mm/h = 2.777777778 × 10⁻⁷ m/s.
How do I convert millimetres per hour to metres per second?
Multiply the value in mm/h by 2.777777778 × 10⁻⁷, or divide it by 3600000. For example, 15 mm/h × 2.777777778 × 10⁻⁷ = 0.000004166666667 m/s.
Is the mm/h to m/s conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (derived units) and Table 8 (non-SI units accepted for use with the SI).
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Millimetres per Hour to Metres per Second (mm/h to m/s). Retrieved October 29, 2026, from https://scientificconverters.com/hydraulic-conductivity/millimeters-per-hour-to-meters-per-second/
IEEE
Scientific Converters, "Millimetres per Hour to Metres per Second (mm/h to m/s)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/hydraulic-conductivity/millimeters-per-hour-to-meters-per-second/