Convert US gallons per day to Cubic metres per second
Convert US gallons per day (gpd) to Cubic metres per second (m³/s) instantly and accurately.
Conversion Formula
m³/s = gpd × 4.381263639e-8
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 metres per second
The cubic metre per second (m³/s) is the SI coherent unit of volumetric flow rate. It is used for large river discharges, turbine inlet flows, and major pipeline capacities. The Amazon River at its mouth averages ≈200 000 m³/s; a large hydroelectric turbine passes 400-800 m³/s; a major municipal water-main carries 5-20 m³/s. 1 m³/s = 1 000 L/s ≈ 15 850 US gal/min = 35.315 ft³/s.
Quick Reference Table
| US gallons per day (gpd) | Cubic metres per second (m³/s) |
|---|---|
| 1 gpd | 4.381 × 10-8 m³/s |
| 2 gpd | 8.763 × 10-8 m³/s |
| 5 gpd | 2.191 × 10-7 m³/s |
| 10 gpd | 4.381 × 10-7 m³/s |
| 25 gpd | 1.095 × 10-6 m³/s |
| 50 gpd | 2.191 × 10-6 m³/s |
| 100 gpd | 4.381 × 10-6 m³/s |