Convert US gallons per day to Cubic feet per day
Convert US gallons per day (gpd) to Cubic feet per day (ft³/d) instantly and accurately.
Conversion Formula
ft³/d = gpd × 0.1336805556
About US gallons per day
The US gallon per day (gpd) equals 3.785411784×10⁻³/86400 ≈ 4.381×10⁻⁸ m³/s, the standard unit in US water-utility regulation and residential water-well pump sizing. The US national average residential water use is about 80-100 gpd per person; a reverse-osmosis membrane module is rated in gpd (50-100 gpd for domestic units). 1 US gpd ≈ 4.381×10⁻⁸ m³/s.
About Cubic feet per day
The cubic foot per day (ft³/d) equals 0.028316846592/86400 ≈ 3.277×10⁻⁷ m³/s, found in US oil-and-gas production reports for low-rate gas wells and groundwater monitoring wells. A marginal coalbed-methane well producing 50 Mcf/d (50 000 ft³/d) of gas represents a modest but economic flow; residential water-well yield tests report in ft³/d. 1 ft³/d ≈ 3.277×10⁻⁷ m³/s.
Quick Reference Table
| US gallons per day (gpd) | Cubic feet per day (ft³/d) |
|---|---|
| 1 gpd | 0.133681 ft³/d |
| 2 gpd | 0.267361 ft³/d |
| 5 gpd | 0.668403 ft³/d |
| 10 gpd | 1.33681 ft³/d |
| 25 gpd | 3.34201 ft³/d |
| 50 gpd | 6.68403 ft³/d |
| 100 gpd | 13.3681 ft³/d |