Millimetres per Hour to Feet per Day (mm/h to ft/day)
1 millimetre per hour (mm/h) = 0.07874015748 feet per day (ft/day). 1 ft/day = 12.7 mm/h. Example: 15 mm/h = 15 × 0.07874015748 = 1.181102362 ft/day.
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1 mm/h = 0.07874015748 ft/day
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millimetre per hour to foot per day converter to paste a column from Excel.
How to Convert Millimetre per Hour to Foot per Day
- 1 mm/h = 0.07874015748 ft/day
- 1 ft/day = 12.7 mm/h
- Example: convert 15 mm/h to ft/day: 15 mm/h = 15 × 0.07874015748 ft/day = 1.181102362 ft/day
Formula
ft/day = mm/h × 0.07874015748031
or ft/day = mm/h ÷ 12.7
Derivation from SI units:
- 1 mm/h = 0.001/3600 m/s.
- 1 ft/day = 0.3048/86,400 m/s.
- 1 mm/h = 2.777777777778 × 10⁻⁷ m/s ÷ 0.000003527777777778 m/s per ft/day = 0.07874015748031 ft/day
Both units are defined exactly, so the factor is exact. Millimetre per Hour definition: millimetre per hour; Foot per Day definition: foot per day.
Worked examples
- A reading of 10 mm/h converts to 0.7874015748 ft/day.
10 mm/h × 0.07874015748 = 0.7874015748 ft/day - A value of 50 mm/h is 3.937007874 ft/day.
50 mm/h × 0.07874015748 = 3.937007874 ft/day
Millimetre per Hour to Foot per Day conversion table
| Millimetres per Hour (mm/h) | Feet per Day (ft/day) |
|---|---|
| 1 mm/h | 0.07874015748 ft/day |
| 2 mm/h | 0.157480315 ft/day |
| 5 mm/h | 0.3937007874 ft/day |
| 10 mm/h | 0.7874015748 ft/day |
| 15 mm/h | 1.181102362 ft/day |
| 25 mm/h | 1.968503937 ft/day |
| 50 mm/h | 3.937007874 ft/day |
| 75 mm/h | 5.905511811 ft/day |
| 100 mm/h | 7.874015748 ft/day |
| 150 mm/h | 11.81102362 ft/day |
Where it's used
Millimetres per Hour are used for sprinkler application rate versus infiltration, while feet per day appear in USGS aquifer reports. 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 foot per day | 0.07874015748 ft/day |
| 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 inch per hour | 0.03937007874 in/h |
| millimetre per hour to gpd/ft² | 0.5890172819 gpd/ft² |
Frequently asked questions
How many feet per day are in 1 millimetre per hour?
1 mm/h = 0.07874015748 ft/day.
How do I convert millimetres per hour to feet per day?
Multiply the value in mm/h by 0.07874015748, or divide it by 12.7. For example, 15 mm/h × 0.07874015748 = 1.181102362 ft/day.
Is the mm/h to ft/day 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).
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "foot".
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 Feet per Day (mm/h to ft/day). Retrieved October 29, 2026, from https://scientificconverters.com/hydraulic-conductivity/millimeters-per-hour-to-feet-per-day/
IEEE
Scientific Converters, "Millimetres per Hour to Feet per Day (mm/h to ft/day)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/hydraulic-conductivity/millimeters-per-hour-to-feet-per-day/