GPM to cfs Converter
Enter the flow rate in gpm below to convert it to cfs.
Convert GPM (US) to cfs
Enter a value in gpm (us) (GPM) to convert to cfs (ft³/s).
US Gallons per Minute to Cubic Feet per Second Conversion Table
Table showing various us gallons per minute measurements converted to cfs. Click any preset value or arrow to load it into the converter.
| GPM (US) (GPM) | cfs (ft³/s) |
|---|---|
| 1 GPM | 0.002228 ft³/s |
| 2 GPM | 0.004456 ft³/s |
| 2.5 GPM | 0.00557 ft³/s |
| 5 GPM | 0.01114 ft³/s |
| 10 GPM | 0.0222801 ft³/s |
| 15 GPM | 0.0334201 ft³/s |
| 20 GPM | 0.0445602 ft³/s |
| 25 GPM | 0.0557002 ft³/s |
| 30 GPM | 0.0668403 ft³/s |
| 50 GPM | 0.1114005 ft³/s |
How to Convert GPM to cfs
To convert gpm to cfs, multiply the flow rate by the following conversion ratio: 0.002228 cfs/us gallons per minute.
Since one us gallons per minute is equal to 0.002228 cfs, you can use this simple formula to convert:
The flow rate in cfs is equal to the flow rate in gpm multiplied by 0.002228.
For example, here's how to convert 5 gpm to cfs using the formula above.
How Many cfs Are in a US Gallons per Minute?
There are 0.002228 cfs in a us gallons per minute, which is why we use this value in the formula above.
Our us gallons per minute to cubic feet per second calculator automatically converts your flow rate measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
GPM and cfs are both units used to measure flow rate. Keep reading to learn more about each unit.
What Is a US Gallons per Minute?
A us gallons per minute is a unit of flow rate equal to 3.7854118 liters per minute (L/min), the base unit for flow rate. Standard US plumbing & pump flow rate (3.78541 L/min). [1]
The us gallons per minute is classified as a US customary unit of flow rate. GPM can be abbreviated as GPM; for example, 1 us gallons per minute can be written as 1 GPM.
When working with gpm (GPM) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, gpm (GPM) are widely used across standard flow rate applications within US customary workflows, engineering documentation, and technical data sheets.
What Is a Cubic Feet per Second?
A cubic feet per second is a unit of flow rate equal to 1,699.0107955 liters per minute (L/min), the base unit for flow rate. River hydrology flow unit equal to 28.3168 L/s. [2]
The cubic feet per second is classified as a US customary unit of flow rate. cfs can be abbreviated as ft³/s; for example, 1 cubic feet per second can be written as 1 ft³/s.
When working with cfs (ft³/s) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, cfs (ft³/s) are widely used across large-scale industrial, bulk, and macro-level flow rate specifications within US customary workflows, engineering documentation, and technical data sheets.
When converting flow rate between gpm (GPM) and cfs (ft³/s), keep full floating-point precision (1 GPM = 0.002228 ft³/s; 1 ft³/s = 448.8311688 GPM) during intermediate calculations and round only the final cubic feet per second figure to match your instrument tolerance.
More US Gallons per Minute & Cubic Feet per Second Conversions
Need to calculate in the opposite direction? Use our cfs to gpm (us) calculator to switch your starting unit immediately. You can also explore related tools such as converting cfs to gpm (us), converting gpm (us) to liters per minute, or converting gpm (us) to m³/s.
Frequently Asked Questions
References
- [1]NIST SP 811 StandardNIST SP 811 (NIST SP 811 App. B.9 (Volume Divided by Time))·Flow Rate Metrology Standard — GPM (US) (GPM) to cfs (ft³/s)
- [2]NIST OWM SpecificationNIST OWM (SI Units — Volume & Flow Capacity)·Unit Specifications: US Gallons per Minute (GPM) (GPM) & Cubic Feet per Second (cfs) (ft³/s)
- [3]BIPM ReferenceBIPM (Coherent Volumetric Flow Units (m³/s))·Conversion Factors & Mathematical Basis (GPM to ft³/s)