Enter your flow rate, head, and efficiency into the calculator to determine your pump’s power requirements.

Pump Power Calculation Formula

The following formula is used to calculate the power requirements for your pump.

Power (kW) = (Flow Rate (L/min) * Head (m) * Density (kg/m³) * 9.81) / (Efficiency (%) * 1000)

Variables:

  • Power is the power required by the pump (kW)
  • Flow Rate is the volume of fluid being pumped (L/min)
  • Head is the height to which the fluid is being pumped (m)
  • Density is the density of the fluid (kg/m³)
  • Efficiency is the efficiency of the pump (%)

To calculate the power, multiply the flow rate by the head, density, and gravitational constant (9.81), then divide by the product of efficiency and 1000.

What is Pump Power Calculation?

Pump power calculation refers to the process of determining the amount of power required to operate a pump at a certain efficiency, flow rate, and head. Proper pump power calculation ensures the efficient operation of the pump, reduces energy costs, and helps in selecting the right pump for specific applications.

How to Calculate Pump Power?

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

  1. First, determine your flow rate, head, and the density of the fluid.
  2. Next, determine the efficiency of the pump.
  3. Use the formula from above: Power (kW) = (Flow Rate * Head * Density * 9.81) / (Efficiency * 1000).
  4. Finally, calculate the power by plugging in the values.
  5. 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 = 200 L/min

Head = 30 m

Efficiency = 75%

Density = 1000 kg/m3

FAQ

1. What is flow rate?

Flow rate is the volume of fluid that moves through a pump in a given period of time, typically measured in liters per minute (L/min).

2. How is pump efficiency calculated?

Pump efficiency is the ratio of the hydraulic power delivered by the pump to the mechanical power supplied to the pump. It is expressed as a percentage.

3. Why is it important to calculate pump power?

Calculating pump power is important to ensure that the pump operates efficiently, to reduce energy consumption, and to select the right pump for the intended application.

4. Can this calculator be used for different fluids?

Yes, you can adjust the density field to match the density of any fluid to calculate the power accordingly.

5. Is the calculator accurate?

The calculator provides an estimate of the pump power based on the inputs provided. For exact figures, it’s best to consult technical documentation or a specialist.