About This Calculator
This calculator converts water flow between gallons per minute (GPM) and cubic feet per second (CFS). It is useful in water resource management, irrigation, and hydraulic engineering.
How It Works
- Select the conversion direction: GPM to CFS or CFS to GPM.
- Enter the numeric input value.
- The calculator applies one of the following formulas:
CFS = GPM × 0.002228
GPM = CFS ÷ 0.002228
Note: 1 GPM ≈ 0.002228 CFS. This ratio is based on US gallons and exact time conversion.
GPM and CFS Conversion Table
| GPM | CFS |
|---|---|
| 50 GPM | 0.1114 CFS |
| 100 GPM | 0.2228 CFS |
| 250 GPM | 0.5570 CFS |
| 500 GPM | 1.1140 CFS |
| 1000 GPM | 2.2280 CFS |
| 2000 GPM | 4.4560 CFS |
Frequently Asked Questions
What does GPM mean?
Gallons per minute — a flow unit common in plumbing and irrigation.
What is CFS?
Cubic feet per second — a standard unit in hydrology and water engineering.
How is the conversion factor 0.002228 derived?
1 cubic foot = 7.48052 gallons and 1 minute = 60 seconds. This factor converts GPM to CFS.
Can this calculator convert both ways?
Yes, it supports both GPM to CFS and CFS to GPM conversions based on the selected mode.