Convert Gallons per Day per Square Foot to Feet per Day
1 US gallon per day per square foot (gpd/ft²) = 0.1336805556 feet per day (ft/day). 1 ft/day = 7.480519481 gpd/ft². Example: 15 gpd/ft² = 15 × 0.1336805556 = 2.005208333 ft/day.
Also searched as US gallons per day per square foot to ft/day, US gallons per day per square foot in ft/day, US gallons per day per square foot into feet per day, gpd/ft2 to ft/day, gpd/ft2 in feet per day, gpd/ft2 into foot per day, US gallon per day per square foot to foot per day, gpd/ft2 to feet per day converter and how many feet per day in a US gallon per day per square foot.
1 gpd/ft² = 0.1336805556 ft/day
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk gpd/ft² to foot per day converter to paste a column from Excel.
How to Convert Gallon per Day per Square Foot to Foot per Day
- 1 gpd/ft² = 0.1336805556 ft/day
- 1 ft/day = 7.480519481 gpd/ft²
- Example: convert 15 gpd/ft² to ft/day: 15 gpd/ft² = 15 × 0.1336805556 ft/day = 2.005208333 ft/day
Formula
ft/day = gpd/ft² × 0.1336805555556
or ft/day = gpd/ft² ÷ 7.480519480519
Derivation from SI units:
- 1 gpd/ft² = 0.003785411784 m³ ÷ 86,400 s ÷ 0.09290304 m².
- 1 ft/day = 0.3048/86,400 m/s.
- 1 gpd/ft² = 4.715952932099 × 10⁻⁷ m/s ÷ 0.000003527777777778 m/s per ft/day = 0.1336805555556 ft/day
Both units are defined exactly, so the factor is exact. Gallon per Day per Square Foot definition: US gallon per day per square foot; Foot per Day definition: foot per day.
Worked examples
- A reading of 100 gpd/ft² converts to 13.36805556 ft/day.
100 gpd/ft² × 0.1336805556 = 13.36805556 ft/day - A value of 1000 gpd/ft² is 133.6805556 ft/day.
1000 gpd/ft² × 0.1336805556 = 133.6805556 ft/day
Gallon per Day per Square Foot to Foot per Day conversion table
| Gallons per Day per Square Foot (gpd/ft²) | Feet per Day (ft/day) |
|---|---|
| 1 gpd/ft² | 0.1336805556 ft/day |
| 10 gpd/ft² | 1.336805556 ft/day |
| 50 gpd/ft² | 6.684027778 ft/day |
| 100 gpd/ft² | 13.36805556 ft/day |
| 200 gpd/ft² | 26.73611111 ft/day |
| 500 gpd/ft² | 66.84027778 ft/day |
| 1000 gpd/ft² | 133.6805556 ft/day |
| 2000 gpd/ft² | 267.3611111 ft/day |
| 5000 gpd/ft² | 668.4027778 ft/day |
| 10000 gpd/ft² | 1336.805556 ft/day |
Where it's used
Gallons per Day per Square Foot are used for older USGS and well-driller reports, while feet per day appear in USGS aquifer reports. Both measure hydraulic conductivity (coefficient of permeability k), so the conversion is a fixed factor.
Gallon per Day per Square Foot to other hydraulic conductivity units
| Conversion | 1 gpd/ft² equals |
|---|---|
| gpd/ft² to foot per day | 0.1336805556 ft/day |
| gpd/ft² to metre per second | 4.715952932 × 10⁻⁷ m/s |
| gpd/ft² to centimetre per second | 0.00004715952932 cm/s |
| gpd/ft² to metre per day | 0.04074583333 m/day |
| gpd/ft² to centimetre per hour | 0.1697743056 cm/h |
| gpd/ft² to millimetre per hour | 1.697743056 mm/h |
| gpd/ft² to inch per hour | 0.06684027778 in/h |
Frequently asked questions
How many feet per day are in 1 US gallon per day per square foot?
1 gpd/ft² = 0.1336805556 ft/day.
How do I convert US gallons per day per square foot to feet per day?
Multiply the value in gpd/ft² by 0.1336805556, or divide it by 7.480519481. For example, 15 gpd/ft² × 0.1336805556 = 2.005208333 ft/day.
Is the gpd/ft² 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
- 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.)".
- 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). Convert Gallons per Day per Square Foot to Feet per Day. Retrieved October 29, 2026, from https://scientificconverters.com/hydraulic-conductivity/gallons-per-day-per-square-foot-to-feet-per-day/
IEEE
Scientific Converters, "Convert Gallons per Day per Square Foot to Feet per Day," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/hydraulic-conductivity/gallons-per-day-per-square-foot-to-feet-per-day/