Enter the flow rate, pump efficiency, and net pump head into the calculator to determine the RPM of your pool pump.

Pool Pump RPM Calculation Formula

The following formula is used to calculate the RPM of your pool pump. 

RPM = (Flow Rate * 3960) / (Net Pump Head * Pump Efficiency / 100)

Variables:

  • Flow Rate is the volume of water being pumped per minute (GPM)
  • Pump Efficiency is the efficiency of the pump (%))
  • Net Pump Head is the total head against which the pump is working (ft)

To calculate the RPM, multiply the flow rate by 3960, then divide by the product of the net pump head and pump efficiency divided by 100.

What is Pool Pump RPM Calculation?

Pool pump RPM calculation refers to the process of determining the rotational speed of the pump’s impeller in revolutions per minute (RPM). This involves understanding the flow rate, pump efficiency, and net pump head. Proper calculation of pump RPM ensures efficient operation and optimal performance of your pool pump.

How to Calculate Pool Pump RPM?

The following steps outline how to calculate the RPM using the given formula.

  1. First, determine the flow rate of your pool pump in gallons per minute (GPM).
  2. Next, determine the efficiency of your pump as a percentage.
  3. Determine the net pump head in feet.
  4. Use the formula from above: RPM = (Flow Rate * 3960) / (Net Pump Head * Pump Efficiency / 100).
  5. Finally, calculate the RPM by plugging in the values.
  6. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem:

Use the following variables as an example problem to test your knowledge.

Flow Rate = 80 GPM

Pump Efficiency = 70%

Net Pump Head = 30 ft

FAQ

1. What is flow rate?

Flow rate is the volume of water being pumped per minute, typically measured in gallons per minute (GPM).

2. How is pump efficiency determined?

Pump efficiency is the ratio of the pump’s hydraulic power output to the mechanical power input, expressed as a percentage.

3. What is net pump head?

Net pump head is the total head against which the pump is working, including factors like elevation, pressure, and friction losses, measured in feet.

4. Can this calculator be used for different types of pumps?

Yes, the calculator can be adjusted for different types of pumps by entering the specific parameters for each pump type.

5. Is the calculator accurate?

The calculator provides an estimate of your pump RPM based on the inputs provided. For exact figures, it’s best to consult your pump’s technical specifications or manufacturer.