cfs to GPM Converter
Enter the flow rate in cfs below to convert it to gpm.
Convert cfs to GPM (US)
Enter a value in cfs (ft³/s) to convert to gpm (us) (GPM).
Cubic Feet per Second to US Gallons per Minute Conversion Table
Table showing various cubic feet per second measurements converted to gpm. Click any preset value or arrow to load it into the converter.
| cfs (ft³/s) | GPM (US) (GPM) |
|---|---|
| 1 ft³/s | 448.8311688 GPM |
| 2 ft³/s | 897.6623377 GPM |
| 2.5 ft³/s | 1,122.0779221 GPM |
| 5 ft³/s | 2,244.1558442 GPM |
| 10 ft³/s | 4,488.3116883 GPM |
| 15 ft³/s | 6,732.4675325 GPM |
| 20 ft³/s | 8,976.6233766 GPM |
| 25 ft³/s | 11,220.7792208 GPM |
| 30 ft³/s | 13,464.9350649 GPM |
| 50 ft³/s | 22,441.5584416 GPM |
How to Convert cfs to GPM
To convert cfs to gpm, multiply the flow rate by the following conversion ratio: 448.8311688 gpm/cubic feet per second.
Since one cubic feet per second is equal to 448.8311688 gpm, you can use this simple formula to convert:
The flow rate in gpm is equal to the flow rate in cfs multiplied by 448.8311688.
For example, here's how to convert 5 cfs to gpm using the formula above.
How Many GPM Are in a Cubic Feet per Second?
There are 448.8311688 gpm in a cubic feet per second, which is why we use this value in the formula above.
Our cubic feet per second to us gallons per minute calculator automatically converts your flow rate measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
cfs and gpm are both units used to measure flow rate. Keep reading to learn more about each unit.
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. [1]
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.
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). [2]
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.
When converting flow rate between cfs (ft³/s) and gpm (GPM), keep full floating-point precision (1 ft³/s = 448.8311688 GPM; 1 GPM = 0.002228 ft³/s) during intermediate calculations and round only the final us gallons per minute figure to match your instrument tolerance.
More Cubic Feet per Second & US Gallons per Minute Conversions
Need to calculate in the opposite direction? Use our gpm (us) to cfs calculator to switch your starting unit immediately. You can also explore related tools such as converting gpm (us) to cfs, converting liters per minute to gpm (us), or converting gpm (us) to liters per minute.
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 — cfs (ft³/s) to GPM (US) (GPM)
- [2]NIST OWM SpecificationNIST OWM (SI Units — Volume & Flow Capacity)·Unit Specifications: Cubic Feet per Second (cfs) (ft³/s) & US Gallons per Minute (GPM) (GPM)
- [3]BIPM ReferenceBIPM (Coherent Volumetric Flow Units (m³/s))·Conversion Factors & Mathematical Basis (ft³/s to GPM)