Convert Millimetres per Hour to gpd/ft²
1 millimetre per hour (mm/h) = 0.5890172819 US gallons per day per square foot (gpd/ft²). 1 gpd/ft² = 1.697743056 mm/h. Example: 15 mm/h = 15 × 0.5890172819 = 8.835259229 gpd/ft².
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1 mm/h = 0.5890172819 gpd/ft²
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millimetre per hour to gpd/ft² converter to paste a column from Excel.
How to Convert Millimetre per Hour to Gallon per Day per Square Foot
- 1 mm/h = 0.5890172819 gpd/ft²
- 1 gpd/ft² = 1.697743056 mm/h
- Example: convert 15 mm/h to gpd/ft²: 15 mm/h = 15 × 0.5890172819 gpd/ft² = 8.835259229 gpd/ft²
Formula
gpd/ft² = mm/h × 0.5890172819307
or gpd/ft² = mm/h ÷ 1.697743055556
Derivation from SI units:
- 1 mm/h = 0.001/3600 m/s.
- 1 gpd/ft² = 0.003785411784 m³ ÷ 86,400 s ÷ 0.09290304 m².
- 1 mm/h = 2.777777777778 × 10⁻⁷ m/s ÷ 4.715952932099 × 10⁻⁷ m/s per gpd/ft² = 0.5890172819307 gpd/ft²
Both units are defined exactly, so the factor is exact. Millimetre per Hour definition: millimetre per hour; Gallon per Day per Square Foot definition: US gallon per day per square foot.
Worked examples
- A reading of 10 mm/h converts to 5.890172819 gpd/ft².
10 mm/h × 0.5890172819 = 5.890172819 gpd/ft² - A value of 50 mm/h is 29.4508641 gpd/ft².
50 mm/h × 0.5890172819 = 29.4508641 gpd/ft²
Millimetre per Hour to Gallon per Day per Square Foot conversion table
| Millimetres per Hour (mm/h) | Gallons per Day per Square Foot (gpd/ft²) |
|---|---|
| 1 mm/h | 0.5890172819 gpd/ft² |
| 2 mm/h | 1.178034564 gpd/ft² |
| 5 mm/h | 2.94508641 gpd/ft² |
| 10 mm/h | 5.890172819 gpd/ft² |
| 15 mm/h | 8.835259229 gpd/ft² |
| 25 mm/h | 14.72543205 gpd/ft² |
| 50 mm/h | 29.4508641 gpd/ft² |
| 75 mm/h | 44.17629614 gpd/ft² |
| 100 mm/h | 58.90172819 gpd/ft² |
| 150 mm/h | 88.35259229 gpd/ft² |
Where it's used
Millimetres per Hour are used for sprinkler application rate versus infiltration, while US gallons per day per square foot appear in older USGS and well-driller 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 gpd/ft² | 0.5890172819 gpd/ft² |
| 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 |
Frequently asked questions
How many US gallons per day per square foot are in 1 millimetre per hour?
1 mm/h = 0.5890172819 gpd/ft².
How do I convert millimetres per hour to US gallons per day per square foot?
Multiply the value in mm/h by 0.5890172819, or divide it by 1.697743056. For example, 15 mm/h × 0.5890172819 = 8.835259229 gpd/ft².
Is the mm/h to gpd/ft² 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, "gallon (U.S.)".
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 gpd/ft². Retrieved October 29, 2026, from https://scientificconverters.com/hydraulic-conductivity/millimeters-per-hour-to-gallons-per-day-per-square-foot/
IEEE
Scientific Converters, "Convert Millimetres per Hour to gpd/ft²," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/hydraulic-conductivity/millimeters-per-hour-to-gallons-per-day-per-square-foot/