RPM to GPM Calculator: Convert Speed to Flow Rate
Convert revolutions per minute (RPM) to gallons per minute (GPM) for your pumps or motors. This calculator helps you determine the flow rate based on the RPM and pump displacement.
Understanding RPM to GPM Conversion
Converting revolutions per minute (RPM) to gallons per minute (GPM) helps you determine the flow rate of fluid being pumped, based on the speed of the pump and its displacement. This conversion is essential for ensuring the correct performance of pumps in various applications.
Conversion Formula
The formula to convert RPM to GPM is:
GPM = (RPM × Pump Displacement × 60) / 231
Where:
- RPM: Revolutions per minute
- Pump Displacement: Pump displacement in cubic inches per revolution
- 60: Constant for converting minutes to seconds
- 231: Constant for converting cubic inches to gallons
Common Applications
| Application | Typical RPM Range | Typical GPM Range |
|---|---|---|
| Residential Water Supply | 500-2,000 RPM | 5-20 GPM |
| Industrial Pumps | 1,000-10,000 RPM | 10-100 GPM |
| Agricultural Irrigation | 5,000-15,000 RPM | 50-150 GPM |
Frequently Asked Questions
What is the relationship between RPM and GPM?
RPM represents the speed of the pump's motor, while GPM represents the flow rate of the fluid being pumped. The relationship depends on the pump's displacement (volume per revolution).
How does pump displacement affect GPM?
The larger the pump's displacement, the more fluid it can move per revolution. A higher displacement requires fewer 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. If you have a pump with variable displacement, you will need to adjust accordingly.