Convert Cubic feet per second to US gallons per day
Convert Cubic feet per second (ft³/s) to US gallons per day (gpd) instantly and accurately.
Conversion Formula
gpd = ft³/s × 646316.8831
About Cubic feet per second
The cubic foot per second (ft³/s or cfs) equals 0.028316846592 m³/s, the primary unit for measuring river discharge and open-channel flow in the United States. The US Geological Survey publishes all streamflow data in cfs; irrigation water rights, flood-control gates, and dam spillway capacities are specified in cfs. The Colorado River at full natural flow is ≈22 000 cfs. 1 cfs = 0.028316846592 m³/s ≈ 28.317 L/s ≈ 448.8 US gpm.
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.
Quick Reference Table
| Cubic feet per second (ft³/s) | US gallons per day (gpd) |
|---|---|
| 1 ft³/s | 646317 gpd |
| 2 ft³/s | 1292630 gpd |
| 5 ft³/s | 3231580 gpd |
| 10 ft³/s | 6463170 gpd |
| 25 ft³/s | 16157900 gpd |
| 50 ft³/s | 32315800 gpd |
| 100 ft³/s | 64631700 gpd |