GPM to CFM Converter
Enter the flow rate in gpm below to convert it to cfm.
Convert GPM (US) to CFM
Enter a value in gpm (us) (GPM) to convert to cfm (CFM).
US Gallons per Minute to Cubic Feet per Minute Conversion Table
Table showing various us gallons per minute measurements converted to cfm. Click any preset value or arrow to load it into the converter.
| GPM (US) (GPM) | CFM (CFM) |
|---|---|
| 1 GPM | 0.1336806 CFM |
| 2 GPM | 0.2673611 CFM |
| 2.5 GPM | 0.3342014 CFM |
| 5 GPM | 0.6684028 CFM |
| 10 GPM | 1.3368056 CFM |
| 15 GPM | 2.0052083 CFM |
| 20 GPM | 2.6736111 CFM |
| 25 GPM | 3.3420139 CFM |
| 30 GPM | 4.0104167 CFM |
| 50 GPM | 6.6840278 CFM |
How to Convert GPM to CFM
To convert gpm to cfm, multiply the flow rate by the following conversion ratio: 0.1336806 cfm/us gallons per minute.
Since one us gallons per minute is equal to 0.1336806 cfm, you can use this simple formula to convert:
The flow rate in cfm is equal to the flow rate in gpm multiplied by 0.1336806.
For example, here's how to convert 5 gpm to cfm using the formula above.
How Many CFM Are in a US Gallons per Minute?
There are 0.1336806 cfm 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 minute calculator automatically converts your flow rate measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
GPM and cfm 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 Minute?
A cubic feet per minute is a unit of flow rate equal to 28.3168466 liters per minute (L/min), the base unit for flow rate. HVAC & air compressor airflow unit (28.3168 L/min). [2]
The cubic feet per minute is classified as a US customary unit of flow rate. CFM can be abbreviated as CFM; for example, 1 cubic feet per minute can be written as 1 CFM.
When working with cfm (CFM) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, cfm (CFM) are widely used across standard flow rate applications within US customary workflows, engineering documentation, and technical data sheets.
When converting flow rate between gpm (GPM) and cfm (CFM), keep full floating-point precision (1 GPM = 0.1336806 CFM; 1 CFM = 7.4805195 GPM) during intermediate calculations and round only the final cubic feet per minute figure to match your instrument tolerance.
More US Gallons per Minute & Cubic Feet per Minute Conversions
Need to calculate in the opposite direction? Use our cfm to gpm (us) calculator to switch your starting unit immediately. You can also explore related tools such as converting cfm 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 CFM (CFM)
- [2]NIST OWM SpecificationNIST OWM (SI Units — Volume & Flow Capacity)·Unit Specifications: US Gallons per Minute (GPM) (GPM) & Cubic Feet per Minute (CFM) (CFM)
- [3]BIPM ReferenceBIPM (Coherent Volumetric Flow Units (m³/s))·Conversion Factors & Mathematical Basis (GPM to CFM)