GPM to CFS Converter
Convert between gallons per minute and cubic feet per second
Flow Rate Conversion
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Conversion Result
1 cfs ≈ 448.831 gpm
Convert GPM to CFS (Gallons Per Minute to Cubic Feet Per Second)
Gallons Per Minute to Cubic Feet Per Second Conversion Table
| Gallons per Minute (GPM) | Cubic Feet per Second (CFS) |
| 0 | 0 |
| 1 | 0.002228010407594 |
| 2 | 0.004456020815187 |
| 3 | 0.006684031222781 |
| 4 | 0.008912041630374 |
| 5 | 0.01114005203797 |
| 6 | 0.01336806244556 |
| 7 | 0.01559607285316 |
| 8 | 0.01782408326075 |
| 9 | 0.02005209366834 |
| 10 | 0.02228010407594 |
| 20 | 0.04456020815187 |
| 30 | 0.06684031222781 |
| 40 | 0.08912041630374 |
| 50 | 0.1114005203797 |
| 60 | 0.1336806244556 |
| 70 | 0.1559607285316 |
| 80 | 0.1782408326075 |
| 90 | 0.2005209366834 |
| 100 | 0.2228010407594 |
| 1000 | 2.2280104075936 |
How to Convert GPM to CFS
To convert gallons per minute (GPM) into cubic feet per second (CFS), use these steps:
- Convert gallons to cubic feet using:
1 cubic foot = 7.481 gallons
So, 1 gallon = 1 ÷ 7.481 ≈ 0.1337 cubic feet - Convert per-minute flow to per-second:
0.1337 ft³ per minute ÷ 60 seconds = 0.002228 ft³/s
Thus, 1 GPM ≈ 0.002228 CFS.
Example: Convert 15 GPM to CFS
15 × 0.002228010407594 = 0.03342015611391 CFS
Real-Life Examples of GPM to CFS Conversion
Kitchen Faucet
Average flow rate: 2.2 GPM
2.2 ÷ 448.831 = 0.004903 CFS
Garden Hose
10 GPM = 0.02228 CFS
Fire Hose
200 GPM = 0.445875 CFS
Household Water Main
30 GPM = 0.066875 CFS
What Is GPM (Gallons per Minute)?
Gallons per minute (GPM) is a unit that describes how many gallons of liquid pass a given point in one minute. It’s used widely in plumbing, irrigation, and fluid mechanics.
- 1 US gallon = 3.785 liters
- 1 GPM = 3.785 L/min
GPM Formulas
From volume and time:
Q = V ÷ t
From pipe velocity and area:
Q = v × A
(Convert to gallons per minute afterward)
What Is CFS (Cubic Feet per Second)?
Cubic feet per second (CFS) measures the volume of fluid passing a point per second. One CFS equals one cubic foot flowing by in one second.
- 1 CFS = 1 ft³/s
CFS Flow Formula
Q = A × v
Where A = cross-sectional area (ft²), v = velocity (ft/s)
Or:
Q = V ÷ t
Where V = volume in cubic feet, t = time in seconds
Where Are These Units Used?
- Rivers: Stream flow rates in hydrology are expressed in CFS.
- Residential and commercial water use: Often measured in GPM.
- HVAC and fire suppression systems: Use both units depending on context.