Convert Millimetres per Hour to Centimetres per Second
1 millimetre per hour (mm/h) = 0.00002777777778 centimetres per second (cm/s). 1 cm/s = 36000 mm/h. Example: 15 mm/h = 15 × 0.00002777777778 = 0.0004166666667 cm/s.
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1 mm/h = 0.00002777777778 cm/s
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millimetre per hour to centimetre per second converter to paste a column from Excel.
How to Convert Millimetre per Hour to Centimetre per Second
- 1 mm/h = 0.00002777777778 cm/s
- 1 cm/s = 36000 mm/h
- Example: convert 15 mm/h to cm/s: 15 mm/h = 15 × 0.00002777777778 cm/s = 0.0004166666667 cm/s
Formula
cm/s = mm/h ÷ 36000
Derivation from SI units:
- 1 mm/h = 0.001/3600 m/s.
- 1 cm/s = 0.01 m/s.
- 1 mm/h = 2.777777777778 × 10⁻⁷ m/s ÷ 0.01 m/s per cm/s = 0.00002777777777778 cm/s
Both units are defined exactly, so the factor is exact. Millimetre per Hour definition: millimetre per hour; Centimetre per Second definition: centimetre per second.
Worked examples
- A reading of 10 mm/h converts to 0.0002777777778 cm/s.
10 mm/h × 0.00002777777778 = 0.0002777777778 cm/s - A value of 50 mm/h is 0.001388888889 cm/s.
50 mm/h × 0.00002777777778 = 0.001388888889 cm/s
Millimetre per Hour to Centimetre per Second conversion table
| Millimetres per Hour (mm/h) | Centimetres per Second (cm/s) |
|---|---|
| 1 mm/h | 0.00002777777778 cm/s |
| 2 mm/h | 0.00005555555556 cm/s |
| 5 mm/h | 0.0001388888889 cm/s |
| 10 mm/h | 0.0002777777778 cm/s |
| 15 mm/h | 0.0004166666667 cm/s |
| 25 mm/h | 0.0006944444444 cm/s |
| 50 mm/h | 0.001388888889 cm/s |
| 75 mm/h | 0.002083333333 cm/s |
| 100 mm/h | 0.002777777778 cm/s |
| 150 mm/h | 0.004166666667 cm/s |
Where it's used
Millimetres per Hour are used for sprinkler application rate versus infiltration, while centimetres per second appear in constant-head and falling-head permeability tests. 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 centimetre per second | 0.00002777777778 cm/s |
| millimetre per hour to metre per second | 2.777777778 × 10⁻⁷ m/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 centimetres per second are in 1 millimetre per hour?
1 mm/h = 0.00002777777778 cm/s.
How do I convert millimetres per hour to centimetres per second?
Multiply the value in mm/h by 0.00002777777778, or divide it by 36000. For example, 15 mm/h × 0.00002777777778 = 0.0004166666667 cm/s.
Is the mm/h to cm/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). Convert Millimetres per Hour to Centimetres per Second. Retrieved October 29, 2026, from https://scientificconverters.com/hydraulic-conductivity/millimeters-per-hour-to-centimeters-per-second/
IEEE
Scientific Converters, "Convert Millimetres per Hour to Centimetres per Second," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/hydraulic-conductivity/millimeters-per-hour-to-centimeters-per-second/