GPM to RPM Calculator: Convert Flow Rate to Revolutions per Minute
Convert gallons per minute (GPM) to revolutions per minute (RPM) for your pumps or motors. This calculator helps you determine the RPM required for a given flow rate in your systems.
Understanding GPM to RPM Conversion
Converting gallons per minute (GPM) to revolutions per minute (RPM) is essential when determining the speed of a pump or motor required to move a certain volume of fluid. The RPM calculation helps you design systems with the proper operating speeds.
Conversion Formula
The formula to convert GPM to RPM is:
RPM = (GPM × 231) / (Pump Displacement × 60)
Where:
- GPM: Flow rate in gallons per minute
- Pump Displacement: Pump displacement in cubic inches per revolution
- 231: The constant for converting cubic inches to gallons
- 60: The constant for converting minutes to seconds
Common Applications
| Application | Typical GPM Range | Typical RPM Range |
|---|---|---|
| Residential Water Supply | 5-20 GPM | 500-2,000 RPM |
| Industrial Pumps | 10-100 GPM | 1,000-10,000 RPM |
| Agricultural Irrigation | 50-150 GPM | 5,000-15,000 RPM |
Frequently Asked Questions
What is the relationship between GPM and RPM?
GPM represents the volume of fluid moved, while RPM represents the speed of the pump or motor. The relationship depends on the pump's displacement (volume per revolution).
How does pump displacement affect RPM?
The larger the pump's displacement, the fewer RPMs are required to achieve the same flow rate. A smaller displacement requires more RPMs to achieve the same GPM.
Can I use this calculator for any pump?
This calculator assumes that you know the displacement of your pump. For pumps with variable displacement, you will need to adjust accordingly.