Flow rate is one of the most critical measurements in fluid engineering, plumbing, irrigation, and construction-related water systems. When working with pipes, channels, or pumps, you’ll often need to convert Cubic Feet per Second (CFS) to Gallons per Minute (GPM) — two commonly used flow rate units in the U.S.
Our CFS to GPM Conversion Calculator helps you quickly and accurately convert these units with ease.
What is CFS and GPM?
- CFS (Cubic Feet per Second) is a unit of flow rate used to measure the volume of fluid passing through a point every second in cubic feet. Common in hydrology and civil engineering.
- GPM (Gallons per Minute) measures how many U.S. gallons of fluid pass a point per minute. Widely used in plumbing, water supply systems, and irrigation.
CFS to GPM Conversion Formula
To convert CFS to GPM, use the following formula:
GPM=CFS×448.831
Where:
- 1 cubic foot = 7.48052 gallons
- 1 minute = 60 seconds
- So, 1CFS=7.48052×60=448.831GPM
Example –
CFS to GPM Conversion
Let’s say you have a flow rate of 2.5 CFS, and you want to convert it to GPM.
GPM=2.5×448.831=1,122.0775GPM
So, 2.5 CFS is approximately 1,122.08 GPM.
GPM to CFS Conversion Formula
If you want to convert back from GPM to CFS, simply divide by 448.831:
CFS=448.831GPM
Example (Reverse):
If you have 2,000 GPM:
CFS=448.8312000≈4.46CFS
Why Is This Conversion Important?
This conversion is critical in:
- Designing irrigation systems
- Sizing water pumps
- Stormwater drainage planning
- Hydraulic modeling in civil engineering
- Water treatment plant flow measurements
Many times, engineers receive data in CFS but need to work with pumps and flow meters rated in GPM — or vice versa.
Final Thoughts
Flow rate conversion plays a key role in designing reliable and efficient fluid systems. With our CFS to GPM Conversion Calculator, you’ll never need to manually multiply or divide again — just enter your value, and get accurate results in seconds.
Check out 3 similar CFS to GPM Conversion Calculator :