Conversion Formula
$$Q_{\text{GPM}} = Q_{\text{CFS}} \times 448.831$$
Multiply the flow in CFS by 448.831 to get gallons per minute.
CFS to GPM Conversion Table
| Cubic Foot per Second (CFS) | US Gallon per Minute (GPM) |
|---|---|
| 0.1 | 44.8831 |
| 0.5 | 224.416 |
| 1 | 448.831 |
| 2 | 897.662 |
| 5 | 2,244.16 |
| 10 | 4,488.31 |
| 25 | 11,220.8 |
| 50 | 22,441.6 |
| 100 | 44,883.1 |
| 250 | 112,208 |
| 500 | 224,416 |
| 1,000 | 448,831 |
CFS to GPM in Engineering
Flow rate conversions are critical for water resources, wastewater treatment, HVAC, and piping design. Civil engineers commonly work with GPM, CFS, and MGD, while mechanical engineers often need CFM for air handling systems.
Cubic Foot per Second: Primary US unit for open channel flow, river discharge, and stormwater design. Used by USGS and FEMA.
US Gallon per Minute: Most common US unit for piping, pump, and plumbing flow rates. Essential for fire protection design.